Abstract: Based on the new methods of crude oil DSC curve calculating wax crystallization, this paper discussed the characteristics of Daqing waxy crude wax crystallization and concluded that there existed the critical temperature depression depth. When low than the critical temperature, flowing ability will worsen sharply. When the temperature depression depth and the ascending temperature is relatively close, waxy crude flowing ability can be farther improved. Therefore we achieved the relationship among critical temperature depress depth, wax crystallization and picking up temperature.