According to the physical principle of engine and the modern control theory, with engine cycle event based periodical sampling, an discrete throttlespeed response model of electrical controlled gasoline engine was developed. By applying the recursive algorithm and I. D. Landau's identification method, this model was experimentally studied on the WF4C27F-E gasoline engine and the model parameters were identified. The model was conducted with corresponding identified model parameters in MATLAB/Simulink environment. The disturbance step response of this simulation model was compared with the real engine experimental data. The results showed that this model has efficiency and accuracy. The conclusion is that the engine throttlespeed response model is universal and adaptive to the same type of controlled gasoline. In addition, it is easy to obtain the model solution and do parameters identification, which means that the throttlespeed response model is very suitable for the online engine diagnosis and the control performance optimization.