In this paper, the related research literature is combed, the principle and properties of frequency diverse array are analyzed and simulated, and the research status of beam control of frequency diverse array is emphasized. This paper analyzes three mechanisms of transmit and receive signal processing for frequency diverse array radar. For two mechanisms, linear constrained minimum variance (LCMV) norm is applied to the adaptive beam forming simulation analysis. Finally, a linear constrained minimum variance criterion algorithm based on variable load constraint is proposed. Based on the first processing mechanism of frequency array radar, narrowband filter is used to filter out only the signal of carrier frequencyfm in channelm. In order to reduce the amount of computation, an upper bound on the weight vector norm is set, and a weight vector and a steering vector are obtained by the steepest descent method. The simulation results show that the algorithm can form a large gain in the desired direction in the presence of 5°error, and the null in undesired direction. Compared with the adaptive algorithm under condition of the first processing mechanism, the time reduces by 27.3%.