The invention provides an instant communication service login method. The technical scheme of the method is as follows: an instant communication
server generates a corresponding login
voucher of a login ID which has logged in an instant communication service successfully, records the login
voucher in the instant communication
server, and returns the login
voucher to a
client for storage; when the
client logs in again with the login ID and a login code which have been successful in
logging the instant communication service, the
client sends the login voucher stored in the client, after successful identity
verification of the login ID and the login code by the instant communication
server, the instant communication server compares the received login voucher with the login voucher of the login ID recorded in the instant communication server, if the two login vouchers are consistent, then there is no need to verify configuration information and the client is allowed to login the instant communication service. Through the method in the invention, there is no need to verify the configuration information repeatedly in every login operation, thereby data interaction in a login process of the instant communication service is reduced, login
processing efficiency is raised, and user experience is improved.