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ould be in the funding and production operations carried out between the rational allocations of interest payments is the surplus value of this specific form of partition.
2.3 An overview Net Present Value Method
Net Present Value Method: It is a method of evaluation of investment projects. The method is to use the net amount of cash benefits and net present value of the total amount of calculated net present value of cash investments, and then to evaluate the net present value of the size of the investment programs (Du, 2004).. Net present value is positive, the investment program is acceptable; net present value is negative, the investment program is unacceptable. Net present value greater investment program the better. Net Present Value method is a more scientific and relatively simple investment program evaluation method.

NPV (Net Present Value) is an investment generated by the discounted value of future cash flows and project investment costs, the difference between Net Present Value method is a method of evaluation of investment programs (Hu, 2004).. The method utilizes the amount of net cash benefits and net present value of the total amount of calculated net present value of cash investments, and then to evaluate the net present value of the size of the investment programs.
3.Research and Difficulties
Deficiencies are the following: (a) It must first determine a line with the economic realities of a benchmark yield rate, the benchmark rate of return is often more difficult to be determined. (b) The financial net present value of mutually exclusive programs must carefully consider the life of the program if the life of mutually exclusive ranges; we must construct an analysis of the same period, in order to carry out comparison and selection among the various programs (Li, 2001). (c) Financial net present value cannot truly reflect the investment in the units in the efficient use of investment. (d) It cannot directly explain the project each year during the operation of the operating results. (e) It did not give the exact benefits of the investment process size does not reflect the recovery rates of technology financing (Song, 2002).
Many people engaged in the field of project management will ask several tough questions:
1. Why is it that many projects run into problems of cost and schedule maintenance?
2. Why is it that the most experienced people, both project managers and project team members run into so many challenges on these projects?
3. Why do many projects fail to satisfy their original expectations?
Organizations which fail to learn from their projects and project performances will be destined to do the same old things the same old ways. "That's not the way we do things here" is commonly heard in organizations with long standing experience. Without a firm commitment to review the performance of projects for the purposes of learning causes an organization to miss opportunities for improvement and the ability to avoid the same mistakes (Qi, 2004).
4. Value Index and comparation
4.1 Value Index
4.1.1  The Internal Rate of Return Method
Based on the Internal Rate of Return Method rule ，an investment is acceptable if the Internal Rate of Return Method exceeds the required return.It should be rejected otherwise.
The Internal Rate of Return Method on an investment is the required return that results in a zero NPV when it is used as the discount rate.
Example:
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