Taking the Radio Tuning Unit software hosted on Radio Tunning equipment for instance, this paper discucces how to achieve the statement coverage object of DO-178C by LDRA TESTBED automatic test tool which can improve the test efficiency during the statement coverage test. Statement Coverage is the basic test coverage object for airborne software and could effectively detect the extraneous code from the source code to improve the quality during the test. The test report indicates the TESTBED can process the code instrumentation and analyse the coverage data correctly. And it can identify the uncovered codes information that provides a source for developer to analyze. The report of TESTBED conforms to the DO-178C object requirement and be provided to the certification authority for review, which can increase the certification credits.