Abstract: An improved clutch of a continuous variable transmission system includes a gear shaft, a driven belt pulley assembly, a clutch disc and a clutch jacket. An internal driving disc sleeve is disposed at the driven belt pulley assembly and connected to the clutch disc. The clutch jacket is connected to the gear shaft through a gear shaft sleeve. When a belt drives the driven belt pulley assembly to rotate at a high speed, the internal driving disc sleeve drives the clutch disc to rotate accordingly, and each clutch pad on the clutch disc is expanded outward due to a centrifugal force and pressed against the clutch jacket to drive both clutch jacket and gear shaft to rotate. An oil seal is installed in a sleeve inside the driving disc and contacted with the internal driving disc sleeve and the gear shaft sleeve to facilitate a shift of gears.