To measure dynamic forces more accurately, a novel elastomer of a six-dimensional force sensor was proposed. The sensor adopted a new inner ring to replace the center platform of the traditional cross beam sensor. Determined the connection mode of the Wheatstone full-bridge circuit, which could realize theoretical decoupling. Then, the key size parameters of the sensor were analyzed by response surface analysis ,and the regression equations between the response value and the key sizes of the elastomer were established, which provided a theoretical basis for the sensor design. The analysis results of the examples in this paper show the sensor has good dynamic performance, with the first-order natural frequency as high as 3196.30Hz. Designed the size parameters by response surface analysis to improve the sensitivity of each force component, which increased the sensitivity of Fx direction by 26.09%.