Thirdly, this paper introduced math theory of NN and how to use it, and introduced analyse way of mainly factors.This paper gave a model of risk forecast base on mainly factors and NN.

• 再次介绍了人工神经网络的数学原理以及使用方法,介绍了主成分分析法,结合主成分分析法和神经网络,给出了项目风险评价模型;