Abstract: Simulink is used to build the control strategy of starting condition and transition to idle speed of high pressure common rail diesel engine.The key control parameters of starting condition such as fuel injection and rail pressure are separated from all conditions, and the connection strategy of two conditions from starting to idle speed is considered.Then scale the policy with Target Link and generate C code.Finally, the test was carried out on a 6-cylinder diesel engine.The experimental results show that the control strategy can realize the fast start and smooth transition to idle speed of high pressure common rail diesel engine in 2 s.