In order to reduce the system complexity and hardware cost of phased array radar antenna, the sparse array and subarray technology are used to optimize the sparse array of antenna array. Firstly, the layout optimization of sparse subarrays is analyzed, and the optimized layout of sparse subarrays is studied based on genetic algorithm; Then, the sparse subarray beam forming algorithm is designed. Firstly, the fixed weighting method is used to obtain the weight vector of the array elements in the subarray, and then the adaptive beam forming algorithm is used to obtain the optimal weight vector of the subarray level data, so as to realize the beam forming of the sparse subarray. Finally, the application software of subarray optimization layout and beam forming is designed. The software has a good human-computer interaction interface, which can play a good role in assisting and verifying the optimization design of antenna array, and effectively improve the automation of optimization design of antenna array. The software has a good human-computer interaction interface, which can play a good role in assisting and verifying the optimization design of antenna array, and effectively improve the automation of optimization design of antenna array.