In order to decrease the lateral fluctuate and implement high speed and smooth conveying and based on the inner-outer compound meshing theory and design method of Hy-Vo silent chain, a new type of double-pitch rocker-pin silent conveyor chain was proposed. The main technical parameters and structure of chain plate were described and its meshing theory and causes of lateral fluctuate were discussed and analyzed. A compared simulation test between the new double-pitch rocker-pin silent conveyor chain and standard round-pin silent conveyor chain about lateral fluctuate had been done to verify the design’s advantages. The analysis results show that the lateral fluctuate value generated by the new double-pitch rocker-pin silent conveyor chain was largely smaller than that of the comparison type. And the design could improve the conveying conditions distinctly.