According to the process of EIA. The methods used can be divided into two categories. One is for assessing the environmental change and impact of each individual parameter, and the other is for assessing the impact of the whole project.

• 依据环境影响的评价程序，采用的方法可分成两大类:一类是评价每一单因子的环境改变及其影响，另一类是评价整个工程的影响。