The invention provides a method for realizing a seamless big world. The method comprises the following steps of: 1, segmenting the big world of a game into a plurality of blocks; 2, managing all entities of each block, and synchronizing player behaviors which are generated by one block and need to be seen by other players to all players; 3, searching for idle servers, distributing the blocks into which the players enter to the idle servers, and running the blocks on the distributed servers; 4, checking the position change of the entity in the block, judging whether the entity crosses the block, and if not, performing no operation; if yes, judging whether the newly entered block of the entity is in other servers or not, if yes, synchronizing all attributes of the entity to the servers where the other blocks are located, deleting the entity from the old block, adding the entity into the new block, and synchronizing the entity to players of the other blocks which newly enter the view; and if not, deleting the entity from the old block, adding a new block, and synchronizing the entity to players of other blocks newly entering the view, thereby realizing a seamless large world.