The STATCOM connected in grid has impact on the protection and consequently results in the order problem of online check. To deal with the problem, this paper proposes a method of protection importance evaluation with STATCOM. This method takes the whole line as the research object, evaluating the line importance comprehensively in terms of grid nodes topology structure, the circuit influence on power transmission, and the degree influenced by STATCOM. The protections are checked according to the sorting result, avoiding wasting the time and resources caused by the unordered and random checking, and improving the efficiency of the online checking. The IEEE 10 machine 39 nodes system is used to simulate, and the result verifies the reasonableness and effectiveness of the proposed method.