Abstract: The pre-heating efficiency and communicating speed in SAGD cyclic preheating period have important effects on production during production period. Through numerical simulation research, a method of accelerating intercommunication speed in SAGD cyclic preheating period was presented, and a preheating mode of ‘low pressure-high pressure-simulated SAGD’ was built, which has effectively improved the hydraulic communication speed between injectors and producers while ensuring low risk in establishing preferred seepage passages in a short time. This method was effectively used in SAGD development of Fengcheng Ultra-heavy Oil Reservoir and is of certain promotion value.