【正文】 ing doing first, is also that the weight avoiding break a rough estimate , effective control engineering of construction costs cost of construction plays with a link. At the same time, the sharpening contract manages , ensures equality and mutual benefit issuing contract of method and contracting method. The construction costs being pleted settling a stage39。s signature and being related to if the design alteration advice note must be made known to lower levels by plain design organ. Scene inspection and control visa must label seal and the ratification going on a punitive expedition to such that designing a personnel etc. having construction site person in charge of first party. Great majority our country construction projects are pleted in the project being under construction when the final account, during the period of the final account being pleted contracting method , are are under construction contracting method calculating monly much in the book being pleted winding up an account , are issue contract of haggie just inexhaustible in devices and schemes , are dispute over trifles phenomenon is grave , project settlement drags repeatedly , some confirmation having drug once and , greatly, affecting engineering construction project sigmatism and building construction costs. A construction project includes the following procedure from brewing , planning , designing that to establishing pletion and missioning: Be that the project letter of advice stage , feasibility appraise the stage , design stage , the stage being under construction , acceptance check stage and the queen being pleted estimate that. Correspondingly, the construction costs ascertaining that and the project construction phase job look at and appraise the stage adapting to , several being allotted in general for the following: The investment studying stage establishment in the project letter of advice and feasibility is estimated, design stage establishment designs a rough estimate in the first step, budget designing that the stage weaves working drawing in working drawing, budget builds ampere of construction costs face to face with working drawing for basis tender project engineering contract, price is also that the form ascertains that with the business contract。 Allin cost costing in the reality being pleted checking and accepting a stage , assembling into engi neering construction process middle all round, weaves the final account being pleted , embodies the actual cost of construction that a construction project according to the facts. Four guess that twovalence is interrelated , the former restricts the latter , the latter supplements the former. What is called, build the construction costs administration and control, it is the occurrence contracting the stage and construction in the investment decision stage , design stage , construction project putting stage into practice with construction construction costs to control within the cost of construction quota O. K. , correcting the deviation happening at any time, to ensure that the project manages the target realization , get fairly good benefit of investment and social benefits in an attempt being able to use manpower and material resources, financial resources rationally in building a project one by one. Second, the importance of the investment decisionmaking stage of project cost control Construction projects in the investment decisionmaking stage, the project of the technoeconomic decisionmaking, as well as the cost of construction projects pleted and put into production after the project costeffective, have a decisive impact on the construction project cost control is an important stage. Project cost management as a decisionmaking stage in the feasibility study report shall be prepared, and economic evaluation of the proposed project, select the technically feasible and economically the construction of example programs and to optimize the construction program on the basis of the preparation of highquality items investment is estimated that the project construction so that the real control of the project has played the role of total investment. The impact of the decisionmaking phase of the project cost are the main factors: a, the determine level of construction standards。 c, building location (site) selection。 e, technology selection f, equipment selection . Such as the choice of builtup areas, there is a basic principle, that is close to raw materials, fuel and consumer principles. This project pleted and put into production, you can avoid the raw materials, fuels, and finished the longhaul transport, reduce costs, lower costs。s economic size, economies of scale, product standard is a reasonable means of production volume, a number of products under certain conditions, was increasing returns of economic phenomena, that is, with the expansion of production volume, unit cost reduction, revenue increase. Therefore, in order to phase in the investment decisionmaking control over project cost effective, we must do a good job in the following areas: (1) the implementation of construction project legal person responsibility system, the construction project from planning to implementation of the whole process of the use of funds and repayment responsibilities to people and projects at the same time establish a system of matching corporate oversight mechanisms, by the petent authorities and supervision of the industry sector establishment of a monitoring group to oversee the use of project funds. (2) to conduct market analysis and seeking truth from facts, to avoid the blindness of the project decisionmaking, reduce risk and lower investment, give full consideration to construction projects in the future petitiveness of the market so that more scientific book design and reliability (3) Capi