In ground-to-air communication systems, the complex propagation environment is affected by multipath propagation leading to severe fading problems at receiver. This paper studies the application of diversity combing techniques in combating channel fading, providing a detailed analysis of the principles behind diversity combing technique. A comparative analysis was conducted on commonly used diversity combing technique, and their effectiveness was simulated and verified. This research offers technical support for the application of diversity combing technique in communication equipment.