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Project investment to investors within a certain time the new, expansion, renovation, restoration activities of an investment made by a project. With the improvement of the social productive forces and the development of science and technology, the size and complexity of the project investment projects increasing, showing a long cycle, large investment and complex internal organization, a large number of random interference factors in the implementation process, resulting in the risk of the project; On the other hand, as the source of funds for construction projects growing market, investors returns of the project particularly concerned about the economic impact of the success of the project, the huge social impact, environmental impact, have led to the project investment decisions increasing demands. In order to ensure that the project's actual income, taking into account their social benefits, environmental benefits and sustainable development capacity, in the decision-making phase of the project, based on risk analysis as the main objective of the project, reasonable comprehensive analysis and evaluation, and take appropriate measures to avoid risks, standardize the construction process, it is necessary to control the cost of investment, promote economic growth, improve the investment environment has a very important practical significance. This article first comprehensive evaluation of the project as a clue, and a brief description of the project economic evaluation, and then with emphasis on the theory of risk analysis, discusses elaborate on the different measures of risk, risk analysis at all stages of the analysis method and its progress , especially risk estimates from the two aspects of probability and loss, thinking and framework of the comprehensive evaluation model of construction investment projects on the basis of the above analysis. In addition, the significance of the project environmental impact assessment has been overlooked described some of his views on how to set up the project environment evaluation. Second, the paper points out the shortcomings in the current project program optimization analysis on the basis of the interaction between the sub-project relationship, learn from virtual enterprise selection mechanism, taking into account the cost and duration of two factors, the establishment of the overall project the cost of the decision-making program to minimize the model, and the genetic algorithm for solving, an illustrative example to understand the feasibility of the model and algorithm. In addition, for the conversion of multiple evaluation, the introduction of projection pursuit model. Finally, the project financing mode to study, analyze and compare their own characteristics and advantages and disadvantages of the mode of BOT, ABS, PPP, TOT, TBT; dynamic model of the evaluation of financing risk. Investment analysis of the project is a very complex system of evaluation, the goal of this study is on the basis of risk analysis, program choices for investors, project financing to provide a reference and learn from.
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