As an important part of aircraft detection system, cargo smoke detection system is to provide detection, monitoring and alarm for smoke and fire in cargo. This article introduces cargo smoke detection system components. The two commonly used cargo smoke detectors are compared and analyzed.The certification requirements are analyzed. The cargo smoke detection tests contain equipment level test, system level test and onboard test, which are intrduced in this article. For the smoke detection system design difficulty and certification verification test, a new research technique is proposed.