Considering the particularities in the powerhouse design of Sanxia Hydropower Station, the load characteristics and process design of laminated air-conditioning at the generator level in summer have been analyzed and discussed. Several methods of load calculation have been analyzed. Based on the results of calculation by these methods, the load characteristics and energy saving benefits have been discussed. Taking a normal section at generator level for an example, the design condition and refrigeration demand have been dissected, thus providing some experiences to this or other project.