In the modern radar software test, due to the scale of software getting larger and larger, the quantity of test cases will be very giant when it meets some test coverage requirements. Intersection method is based on orthogonal arrays，by which software test can meet some coverage requirements on a small quantity of test cases．This paper introduces the basic conceptions of intersection method, analyzes the feasibility of applying this method to test case design，and presents the detailed test steps．A test case design for target track module by using this method is given to prove the applicability and validity of the method.