Abstract: An innovative scheme for the structure design of a UAV radar is presented in this paper. The key technologies and the corresponding implement methods are also discussed in detail. Several solutions in technology to make the radar smaller and lighter are analyzed. The cooling scheme to add radiators on the radar box is put forward. The cooling problem of the radar can be solved because of the forced convection caused by the relative movement between the radiator and air during flight. The scheme can solve the difficult problems (space, weight and cooling resources) in the structure design of the UAV radar successfully. The ideas and methods to solve these key technological problems can be used as reference for structural design of the similar UAV radar．