1. The concept of precision management and control: Precision management and control is based on scientific management. On the basis of precise positioning, the goals are carefully analyzed through a combination of quantitative and qualitative methods, and elements such as tasks and resources are finely divided into specific tasks according to different goals. At this point, we should reject the general and general approach to work, adopt targeted modern technologies, methods and theories, etc., so as to continuously reduce the waste between goals and results, and achieve the necessary functional requirements with the least consumption. Meet customer needs, achieve strong effectiveness for different goals, and maximize value engineering, thereby improving management efficiency and result quality.

2. Engineering project cost control: refers to using appropriate methods to manage various costs incurred during the implementation of the project, limiting and adjusting them through appropriate measures, and at the same time correcting deviations that have occurred and will occur in a timely manner. It is also necessary to control construction costs so that they are within the planned cost range to ensure that project cost control objectives are achieved. According to the principles and content of cost control, the key control is whether the management behavior for cost control meets the requirements and whether the cost indicators that reflect the performance of cost management are within the expected range. Therefore, to do a good job in cost process control, there must be Standardized and normalized process control procedures. The general project cost control procedure is shown in Figure 1.

The characteristics of engineering project control can be summarized into three characteristics: complexity, variability, and real-time.

(1) Complexity: Engineering project cost control needs to involve multiple aspects, including the costs of material procurement, worker wages, equipment leasing and other aspects. There are complex relationships between these costs that require in-depth analysis and understanding.

(2) Variability: Engineering project costs are affected by many factors, such as market changes, policy adjustments, weather and other factors. These factors will lead to changes in costs and require timely adjustment and control.

(3) Real-time: The control of engineering project costs needs to be updated and adjusted in a timely manner. Various expenses in the project change over time and need to be adjusted based on real-time conditions to ensure the effectiveness of cost control.

(1) The cost budget is inaccurate. Many project cost estimates are based on historical data, experience and estimates, and these methods may not fully take into account the project's particularities and realities. Inaccurate cost budgets may lead to overspending, funding shortages, project delays, resource waste, etc. Accurate cost budgets are crucial to cost control of engineering projects. The project management team needs to fully consider various factors and conduct detailed and comprehensive cost estimates in order to better control the costs and risks of the project.

(2) Cost information is not obtained in a timely manner. In project management, the acquisition and timely feedback of cost information is very important for project progress and quality control. However, in actual operations, due to issues such as data sources and quality, there is often a lag in the acquisition and processing of cost information, which results in the inability to discover in time. Cost anomalies, difficulties in monitoring cost effectiveness and forecasting and planning. Enterprises should ensure that they establish an effective cost information acquisition system and obtain and analyze cost data in a timely manner to support the effective implementation of cost control.

(3) Construction materials supervision is not in place. Construction materials and construction equipment are an important basis for ensuring the smooth construction of construction projects, and are also a key guarantee for improving the quality of construction projects. Inadequate supervision of construction materials will lead to increased procurement costs, waste of resources, delays in construction progress, and difficulty in cost control and prediction. In order to ensure cost control of engineering projects, a reasonable material management system should be established to strengthen the purchase, storage, and use of materials. and accounting and other aspects of management, and improve cost control strategies.

Traditional extensive project cost control is used to control a certain point, while precise control theory emphasizes precise management of the entire process, not limited to one or a few processes and activities. Precise cost control is an important aspect of engineering project management. It can help project managers and teams effectively control project funds and avoid budget overruns and wastage of funds. It is of profound significance to engineering construction. The necessity of accurate cost control of engineering projects is mainly reflected in the following three aspects:

(1) Improve project management level. Precise cost control of engineering projects can improve the construction quality of construction projects and increase corporate profits. An excellent construction project manager should conduct detailed management of project construction quality, progress, safety, cost, etc. throughout the entire process. If one of the small links is not done well and the next link is continued, the management effect will not be maximized. Therefore, if managers want to improve the overall management quality of construction projects, they need to do a good job in management and cost control, and control costs within a controllable range, thereby reducing the waste of energy and resources, thereby reducing construction costs. .

(2) Increase profits of construction companies. Generally, the construction period of construction projects is very long, so construction projects are easily affected by many factors during the construction process, which leads to changes in project costs, resulting in a large difference between actual costs and budgeted costs. Strengthening precise cost control can help enterprises to do cost prediction, control, analysis and other tasks based on overall reality. For example, when preparing the budget, factors such as the time of the construction project and material price fluctuations are taken into consideration. A monitoring system is set up at the construction site to monitor the entire construction process and control the construction progress and quality, so as to first Timely discover and analyze the capital losses existing during construction, promptly adjust reserved funds, and adopt scientific cost management measures. By making timely adjustments to existing risks, we can avoid cost overruns in project construction and ensure the efficiency of construction companies.

(3) Promote the development of the construction industry. With the further deepening of the reform of my country's economic system, the homogeneity problem of construction enterprises' business and products has become more and more serious, which has also made the competition among enterprises more and more fierce. In order to achieve sustainable development, construction enterprises must transform and upgrade, and This requires a lot of financial support. Strengthening cost control and optimizing the cost management system can effectively increase cost profit margins. Compared with peers in the same industry, companies have extra funds to expand markets or businesses, which effectively improves their ability to respond to market risks. Precise cost control can help companies save construction costs. Construction companies can obtain considerable benefits while improving construction quality, improve the company's project efficiency, and enable companies to gain a firm foothold in the market.

Project cost control is the supervision and inspection of project costs in accordance with the requirements of the contract during the process of cost occurrence and formation. The occurrence and formation of costs is a dynamic process, which determines that cost control should also be a dynamic process, that is, process control. Cost control should follow the principle of continuous improvement and improvement, and the precision management and control theory is also a process of continuous improvement, which exactly matches cost control and can be better integrated.

(1) Strengthen the management of construction materials. In project cost control, the cost of building materials is a particularly critical element. Management and control of building materials should be strengthened to avoid waste problems and improve project cost control capabilities. First of all, according to the specific conditions of the construction project, accurate calculations should be used to provide a key basis for the implementation of project cost control work, and then the amount of construction materials should be reasonably planned through precise planning. At the same time, construction materials should be accurately controlled to prevent construction materials from being used. If there are problems that lead to the project being unable to be delivered as scheduled, in the process of selecting construction materials with relatively high cost-effectiveness, a supply contract must be signed to reduce excessive price increases due to market changes. Finally, during the construction of a construction project, the entry and exit of building materials should be controlled to understand the actual use of building materials, ensure the efficiency of construction projects, and improve the effectiveness of cost control.

(2) Establish an effective cost information management system. The theory of "precision management and control" emphasizes the exchange of information between participating entities, and uses information technology to achieve information sharing and avoid cost waste caused by errors or delays in information transmission. Based on this, establish an effective cost information management system, obtain and analyze cost information in a timely manner, and provide decision support through intelligent methods. It is of great significance to achieve precise cost control. To establish an effective cost information management system, you first need to establish cost management standards and formulate cost management goals, principles, methods and processes. Secondly, you need to establish a complete cost accounting system to facilitate better and accurate calculation and analysis of costs. At the same time, , companies can control costs by predicting and monitoring performance results, and allocate costs to various business branches according to different cost types to form a more accurate cost analysis and find the optimal cost within a known cost range. Cost allocation plan and cost budgeting. By using emerging technologies, such as artificial intelligence, cloud computing, etc., we can analyze and manage costs to improve management efficiency and accuracy. Finally, cost information is visualized and a decision support system is established to help managers at all levels of the enterprise analyze cost data in a timely manner and make accurate decisions. Through these measures, companies can achieve precise control of cost information and improve their economic efficiency and competitiveness.

(3) Build a cost prediction model. Cost control is an application of the "precision control" theory. The establishment of predictive models can help companies formulate budgets and cost plans more accurately. First, by collecting historical cost data, filtering the data, removing unnecessary data, and processing possible missing, duplicate, and erroneous data, and then conducting visual and statistical analysis of the data to explore the trends and correlations of cost changes, you can use Various statistical methods and charts, such as scatter plots, trend charts, box plots, etc., select appropriate modeling methods based on data analysis and characteristics, establish prediction models, and finally accurately evaluate the models, and analyze the evaluation results , the first model is adjusted and optimized. After establishing the prediction model, the company can formulate a more effective cost control plan based on the prediction results of the model, thereby improving the accuracy of the cost budget and avoiding possible cost risks. The following is the cost prediction model construction process, as shown in Figure 2.

Project cost control is not only related to project profit and loss, but also to project quality and project construction efficiency. It must be fully implemented throughout the entire process of project implementation in order to optimize project management. Through exploration, it can be seen that the use of "precision management and control" theory to carry out precise cost control of engineering projects has huge advantages and potential. This article proposes precise cost control of engineering projects based on the "precision management and control" theory, establishes an effective cost information management system and constructs a cost prediction model, which plays a very good guiding role in achieving precise cost control of engineering projects. At the same time, during the writing process, we also found that there are still some deficiencies in practical applications, which require further in-depth research and improvement. In summary, the precise cost control of engineering projects based on the "precision management and control" theory is one of the effective ways to improve the efficiency and quality of engineering project management, and has a positive role in promoting the development of engineering projects.