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To improve the stable and dynamic characteristic of high-power natural gas engine idle speed, an idle speed control strategy was accomplished by V-model based on a six-cylinder natural gas engine with electric controlled multi-point injection system. First, the target idle speed was designed to be calculated in different ways according to different engine working conditions, and PI control was determined by engine characteristics. In order to realize an excellent control effect, the electronic throttle angle was controlled by different PI control parameters which was looked up by the difference between target idle speed and engine transient speed. Then, using the software MATLAB/SIMULINK, a simulation engine model was set up based on the test engine which was used for software in the loop test of idle control strategy and for pre-calibration. Finally, the idle control strategy was further verified and calibrated by engine bench test. The test result shows that: the responding speed of engine speed is about 1s, the transient time is about 2s, and the steady state error is less than ±5r/min, which has an excellent control on the test engine by the idle speed control strategy.