First of all, determine the scale of the investment estimates, the project technology, engineering, materials, equipment and construction scale of the program, and the basic determination of the program, the parties reached consensus, then the total cost of the project and sub-items, sub-period costs are estimated. The investment estimate shall include construction investment, interest during the construction period and working capital. The stage of investment decision includes project proposal and feasibility study. In the stage of investment decision-making, we should plan the cost according to the pre-selected plan, and estimate the fixed assets and current assets needed by the project construction by using the investment estimation methods such as the unit production capacity estimation method and the proportion estimation method, through the active cost plan thought, the comprehensive consideration project cost, the progress, the quality goal, carries on the multi-plan comparison to the project. Do the preparation work before the project design. Prior to the start of the investment decision-making phase, plan for the various scenarios that will affect the cost of the project. Do a good job of basic data collection and collation and data analysis to ensure thorough and accurate. First, whether the condition of the water and electric circuit and the geological condition of the project site will affect the cost of the subsequent construction, and make the cost estimate in time; second, the price information of the main materials, equipment and labor costs, according to the local price near the purchase of equipment and employment of workers;.