Abstract: The structural design of phased-array antenna of airborne radar involves such factors as its volume, weight, strength, etc. and thus should be considered carefully and comprehensively. This paper takes some phased-array antenna as an example, in terms of the requirement of the working environment describes briefly the structural features of the phased-array antenna. Also, we emphasize structural composition, random error analysis and mechanical load analysis of the phased-array antenna, and suggest the direction of future development.