A call control method in a CDMA mobile radio communication system which can maintain the forward load in a sector below a predetermined level even when a forward sector capacity is overloaded by estimating the sector forward power using powers of activated traffic channels allocated to the sector when originating and terminating calls are controlled in the mobile radio communication system. According to the call control method, a forward sector excess capacity is calculated from the sector forward power for a predetermined period, a call and/or handoff call attempt block threshold value is determined using the calculated forward sector excess capacity, and then a call and/or handoff call is allocated by comparing the call and/or handoff call attempt block threshold value with the forward sector excess capacity value when a certain mobile unit requests a call allocation.