As a kind of wide application of transmission device, the synchronous belt wheel at the time of application, must be able to present a very optimal transmission effect. For the optimization of the transmission effect, from its present in the transmission of these characteristics, can be clearly shown: transmission features a: drive is very accurate. Is the manifestation of synchronous belt wheel in transmission, it can present a very accurate transmission effect, to ensure accurate and reliable transmission. The transmission characteristics of the two: non-slip at work. Synchronous belt wheel in present the accurate transmission effect at the same time, at the time of transmission work, also won't appear sliding phenomenon, so to realize reliable transmission. The transmission characteristics of the three: constant transmission ratio. Synchronous belt wheel in the transmission of the transmission ratio is constant, so can keep stable transmission speed and the constant efficiency, in order to make equipment to achieve stable operation and function. Transmission is very accurate, non-slip and transmission ratio is constant at work, is present in the transmission characteristics of synchronous pulleys, from these transmission characteristics, can clearly its application in transmission equipment, inevitably can realize optimization of the application, especially to present the optimization of transmission effect.