The present invention relates to a start control method for a service module and a start control method after crash and restart of a service module. The start control method comprises: an operation maintenance center reads configuration information, and initializes a service module into a non-configured state; the service module applies to the operation maintenance center for service configuration information after start; the operation maintenance center issues the service configuration information to the service module, and modifies the start state into a configured state at the same time; after completing configuration thereof, the service module applies to the operation maintenance center for a start command; the operation maintenance center modifies the start state of the service module into a to-be-stated state, and then, sequentially issues start commands according to start order requirements; after completing start, the service module sends a start response to the operation maintenance center, and the operation maintenance center issues a start command to a latter service module in a start order only after receiving the start response of the former service module. The method of the present invention makes start and restart be more flexible and reliable, and enhances the reliability of communication services at the same time.