Preparing the EIA of single key project or its coordination with other projects in order to prevent the negation of the key project by environmental impacts to influence the feasibility of the whole plan.

• 为使各比较方案特别是选定方案，不致因环境影响动摇它的成立，所以对影响方案成立的关键工程（主体工程），还应进行单独的或部分联合的工程环境影响评价。