The invention discloses a controlling method of gasoline direct injection engine optimal ignition angular advance. The process of obtaining the optimal ignition angular advance is that a water inlet and outlet temperature of a motor, an air inlet temperature of a motor, air fuel ratio of a motor, altitude of an automobile, waste gas recirculation rate, variable air valve timing opening, a spraying mode and knocking controlling are logically operated after a base ignition angular advance is set. The base ignition angular advance is calculated and revised according to influences of the eight factors in sequence. The base ignition angular advance is revised through the influence of each factor, the ignition angular advance is controlled at the best time all the time no matter the motor is operated under any working condition and any environment, power performance, economy and discharging time of the motor are at the best state.