The inertial force and moment produced by the crankrod mechanism is an important factor of the vibration of the single-cylinder internal combustion engine.Based on ADAMS which is a dynamic simulation software and Pro/E

the virtual prototyping model of crank-connecting rod of single-cylinder internal combustion engine is established.A dynamic simulation analysis and comparison the value of the analysis

such as the speed、acceleration with the theoretical analysis are carried out.The results verify that the model is the correctness.Inertia force of the mechanism which functions on the cylinder block and the balance problem are studied.Through parametric optimization analysis

the best mass parameters of crank are building.The dynamics performance is enhanced and the design efficiency is improved greatly.