Air turbulence occurs frequently over East Asia and significantly affects the aviation safety. In this study, the in-situ eddy dissipation rate (EDR) observations from commercial aircraft are used to present the distribution characteristics of turbulence in the troposphere over East Asia; combined with the ERA5 reanalysis data and the cloud-top phase product based on the advanced Himawari imager (AHI), these data reveal that turbulence activities are directly linked to cloud, the westerly jet, and topographic forcing. For all-sky turbulence, high frequency areas where stronger turbulence occurs are closely related to cloud distribution in both winter and summer; but for clear-air turbulence (CAT), it occurs more often in the shear instability regions induced by the westerly jet. Large amplitude terrains also cause significant changes in wind field, thus stimulating more stronger turbulence events. These results are helpful to a comprehensive understanding of the laws of air turbulence activities over East Asia.