The invention relates to a control method of predicative proportion integration differentiation of a gasifier; aiming at the characteristics of nonlinearity, long time delay and strong coupling of the gasifier in the controlled process, the method uses the advantages of robustness and easy realization of the conventional PID control algorithm, combines the effectiveness of the predicative control method to the object with long time delay, uses the predicative control idea into the conventional PID control algorithm, uses a variable predictor to predict the input of the controlled object of the gasifier after L time, leads the reference input and the output of the variable predictor to subtract, takes the obtained results as the deviation of the entrance of a PID regulator, carries out a plurality of times of calculation, leads output of the obtained controller by two times of calculation to be constant basically, outputs the control function, realizes the advanced action of the regulator and still obtains good control quality when the working condition of the gasifier occurs larger range change. The predicative PID algorithm of the gasifier is simple and is easy to be implemented on the software/hardware platform of the existing business control system.