A control system for automatic transmission, eliminating time-dependent deterioration affect caused by control system and implementing the wished variable-speed action for a long-time through building control software system of learning correction without suppressing the storage capacity and without too much or too little learning correction amount. The control system including a friction engagement element, a solenoid valve, an engagement pressure control valve and an electronic control unit, wherein a learning correction amount is divided into an initial learning amount that has no dependence upon an engagement pressure command value PO and a time-dependent deterioration amount that has dependence upon the engagement pressure command value PO, and wherein a time-dependent deterioration correction amount delta PEO is determined according to the engagement pressure command value PO and a degree of progress of time-dependent deterioration that is indicated by a difference between a learning region correction amount delta PL and an initial learning amount PS which are obtained by a learning control in a learning region that is a limited input torque region, and a final engagement pressure command value PO<*> is calculated as the learning correction amount by adding the initial learning amount at the time of correction to the time-dependent deterioration correction amount.