ABSTRACT This article refers to by the Jeeta 195 gasoline engine’s related parameter achievement, it has carried on the structural design compution for main parts of the crank link mechanism in the gasoline engine with four cylinders, and has carried on theoretical analysis and simulation analysis in computer in kinematics and dynamics for the crank link mechanism. First, motion laws and stress in movement about the crank link mechanism are analyzed in detail and the precise analysis results are obtained. Next separately to the piston group, the linkage as well as the crank carries on the detailed structural design, and has carried on the structural strength and the rigidity examination. Once more, applys three-dimensional CAD software Solidworks establishing the geometry models of all kinds of parts in the crank link mechanism, then useing the Solidworks software assembling function assembles the components of crank link into the piston module, the connecting rod module and the crank module, then using Solidworks software mechanism analysis module (Pro/Mechanism), establishes the multi-rigid dynamics model of the