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Cell outage compensation is the key technology of self-managed network, which aims to automatically mitigate outages that occur in radio networks due to unexpected failures. However, there are few detailed mechanisms to automatically compensate the coverage hole of the outage cell. In this paper, an adjusting pilot power based mechanism of compensation in wireless access network is presented. It compensates the coverage hole by automatic adjustment of pilot power in surrounding cells in order to meet the operator's performance requirements based on coverage and capacity to the largest possible extent. The experiment results show that the proposed mechanism is feasible and efficient. It could effectively and automatically compensate the coverage of cell in outage without pilot pollution, and impair the QoS as little as possible.