A synchronization method for call supplementary service configuration includes: receiving an entered supplementary service configuration instruction, and obtaining a configuration parameter corresponding to the supplementary service configuration instruction; uploading the configuration parameter to a mobile switching center by using a circuit switched domain, so that the mobile switching center stores the configuration parameter as call supplementary service configuration of the circuit switched domain into a home location register; receiving returned configuration feedback information; and determining, according to the configuration feedback information, whether configuration succeeds, and storing the configuration parameter as on-terminal call supplementary service configuration if the configuration succeeds.