Synchronous belt drive has such features as exact transmission ratio, non-sliding, constant velocity ratio which can be gained, even motion, adsorption of vibration, little noises, the big rang of linear velocity can reach normally reach 1: 10, that the allowed from afew W to hundrends of KW, high transmission efficiency which normally reach 0.98, compacting structure, the suitability to multiaxle fore, the product can normally work well in the places where no pollution is allowed and where the working condition is worse and can widely be used in machinery drives, such industry as automobiles, machine tools, textile, chemical engineering, ligh industry, mining instruments, oil industry and so all kinds of other machinery drive.