The present disclosure provides a method and a system of moving a character in an online game. The method includes: receiving, by a first client, a movement instruction for a specified character, where the movement instruction includes a destination grid, acquiring a game map including a marked dynamic blocking grid, where the marked dynamic blocking grid is a dynamic blocking grid on which a game character exists, establishing an optimal path from a current start grid on which the specified character is located to the destination grid specified in the movement instruction without traveling through the marked dynamic blocking grid, generating movement information including the specified character and the optimal path, and sending the movement information to a server; and receiving, by the server, the movement information sent by the first client, and sending the movement information to all clients except the first client by group messaging.