Abstract: An offline game storing system and a game progress storing method of an offline game are disclosed. The offline game storing system comprises a client and a server, wherein a management server in the server receives a request from the client for uploading or downloading a game progress file, stores an uploaded game progress file to a game progress storage server, or sends a game progress file corresponding to the downloading request in the game progress storage server to the client. The game progress storing method comprises the following steps: a progress file of the offline game is uploaded to a server, or a game progress file is downloaded from the server and the offline game is played according to the progress file.