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Electric load device is widely used in performance test and maintenance of electric generating set. In order to improve its intelligent level, we designed and implemented a control system based on Siemens S7-200 PLC, whose strategy is find out at first those combinations of gears that could make the sum of their powers equal to the set value of power, then eliminate from them the ones that unable to operate due to device failure, and finally pick out the optimal one according to two rules:the number of manipulated gears is the minimum and the action time of gear is the minimum. This intelligent control system could reduce the burden of operators, balance the action times and lives of contactors, and ensure the test going on as far as possible when device failure happens.