The invention relates to a time synchronization method and system for a business process test and a slave server. The time synchronization method comprises the steps of monitoring time of a master server; when the time of the master server is inconsistent with local time, obtaining a name of service needing to be restarted configured by the master server; and stopping corresponding local service according to the name, modifying the local time to be consistent with the time of the master server and restarting the local service. The method, the system and the slave server have the following advantages that 1, the switching time is uniform; 2, the speed is fast and the slave servers do not need to be logged in one by one for modification; and 3, the service needing to be tested is prevented from not being performed according to normal logic.