From spatial dimension it can be classified as assessment for individual project,for a system of projects,and even for all the projects included in the river basin planning.

• 从空间关系讲可分为单一工程的环境影响评价和几个工程联合运转的环境影响评价乃至流域规划全部工程联合运转的流域规划环境影响评价。