Theory of economic liberalism has undertaken theological, metaphysic, and positive stages.

From preparing stage before construction,collection and visa stage during constructing process,settlement material arrangement in finishing stage and claims stage,it elaborates and analyzes on how to do well in project claims,so as to reduce cost and create larger benefit space for enterprises.

Measures to strengthen cost control in project implementation stage by construction part;

Schedule and investment management in implementation stage of engineering project based upon PDCA method;

On the cost control in the construction project implementation stage;

Cost management in the construction process consists of bidding management, construction management and closing account management, to which the article approaches.

Analyzing the cost control during the construction process of electric power transmission and transformation process,making specific expatiation of foundation of cost control,key points and effective method for reducing the cost of projects and promoting the development of transmission and transformation industry.

Project cost management in executing stage of project item construction;

The contract price of a project is the goal of the construction cost control in executing stage The invest- ment in this stage is much bigger than that of other stages.

According to some aspects of investment control of building project construction stage,author provides some ideas about investment control in full course of construction,which based on combination of theory and pratice.