Microwave Landing System (MLS) is one of the major landing systems for aircraft which has the important influence on the safety in complex weather and electromagnetic environment. This paper focuses on the design and realization of MLS airborne equipments. The advantages of MLS are introduced and then the key technique and the solution on the design of modern avionic system are described. Using the bus communication and integrated display, the coordinate transform and backup display are designed for the accurate guidance and reliability of microwave landing, and the safe landing under the complex condition can be realized.