The present invention provides a power control method of a forward-acknowledgement channel and acknowledgement control method thereof, by which acknowledgement or non-acknowledgement information for a boost mode operation used for a quality of service (Qos) can be efficiently received. The present invention includes the steps of receiving packet transmission information in a base station and determining a power of a transmission signal transmitted via the forward-acknowledgement channel (F-ACKCH) using an increment for a reference transmission power value of a boost mode in case that the packet transmission control information contains a boost operation.