The invention discloses a method and a device for adjusting a range expansion offset value of a micro cell in an environment in which at least one micro cell is arranged in a macro cell. The method comprises the following steps that: under the condition that the range expansion offset value is required to be adjusted, a base station of each micro cell determines a candidate range expansion offset value set, wherein under each range expansion offset value except for a zero offset value in the candidate range expansion offset value set, a signal to interference ratio of each piece of user equipment related to the micro cell according to a first rule is not smaller than a first threshold value; and according to a second rule, one range expansion offset value is selected from the candidate range expansion offset value set and is used as a new range expansion offset value of the micro cell. According to the method and the device, effective inter cell interference coordination (ICIC) can be implemented, and giant or even insufferable expense is avoided.