To solve the synchronization problem of ST and DDST method, the paper raises a synchronous deviation estimation method in case of unknown channel order. Through improving the synchronous deviation estimation method in case of known channel order, the paper simulated the synchronous deviation estimation of ST and DDST, analyzed the synchronous deviation of DDST channel estimation in case of multiple different delay. The results of simulation and verification show that the improved algorithm is appropriate for the synchronous deviation estimation in case of unknown channel order. It can correctly estimate the synchronous deviation of different order situation.