In order to optimize the design flow of side link load and control sensitivity characteristics, an optimal control sensitivity design method based on C* criterion is proposed. Based on foreign experience, the parameters were designed according to C* criterion. The influence of pilot ergonomics and side stick performance on flight experience was introduced, and the design method of side stick optimal force feeling characteristics was introduced. Combined with the traditional flying quality specification, the closed-loop model of pilot and pilot was built for verification. The experimental results show that the side stick has different weights of longitudinal angular rate and overload control at different speeds, and the response meets the first-level design requirements of the C* criterion. The simulation verifies the effectiveness of the combined optimization of side stick parameters and flying qualities.