Provided are a method and device for processing a standard version mode of a base station, a terminal and a base station. A base station working in a first standard version mode judges whether a working mode of the base station needs to be adjusted, the first standard version mode is a mode of providing services for a first standard version terminal at least supporting a first standard version. If a judging result is yes, the base station adjusts the first standard version mode to another standard version mode, wherein said another standard version mode is a mode of providing services for other standard version terminals at least supporting another standard version other than the first standard version. Through the solutions, the problem that the system spectrum efficiency is hard to improve effectively and the networking flexibility is low due to the excessive emphasis on backward compatibility can be solved.