In order to provide a reliable foundation for project decision

some sorts of financial indexes of the project

such as NPV

IRR etc

should be accurately estimated out in the earlier stage. However

these indexes appear in the future randomly

and their estimation in the earlier stage is at risk. In this paper

taking the project's NPV as example and applying simulation method to its estimation

the authors developed a comparatively objective evaluation method of construction projects. Furthermore

the outcome of the simulation method is tested by comparing it with the result of another evaluation method.