Array antenna sharing design can significantly improve the utilization efficiency of the antenna.The current array antenna design focuses on two or more radar array.In addition,if radar array and communication array elements are in interleaved arrangement based on sparse array technology,the integration of radar and communication will be implemented.Firstly,based on cyclic difference sets theory,sparse array radar is established,and the sparse array radar antenna pattern is analyzed.Meanwhile,the untaken array elements are remained for communication.Secondly,a further array arrangement is executed to improve communication channel gain based on the channel rank deficient effect.Finally,technical indicators of the radar and communications integration antenna are simulated and analyzed,which verifies the effectiveness of the proposed method.