The invention discloses an air system with unbalanced air flow control, which comprises an air preheater, an air preherater air inlet channel and an air preheater air outlet channel, wherein the air preherater air inlet channel and the air preheater air outlet channel are communicated with the air preheater; N partition boards are arranged in the air preherater air inlet channel to divide the airpreherater air inlet channel into N+1 small channels; and the insides of the small channels are provided with N regulating air doors. The system enables a passing air flow in the air preheater to produce a certain deviation according to the change of the metal temperature of a heat storage plate by regulating the air flows in the air channels so as to improve the efficiency of the heat exchange between the air and the heat storage plate and reduce the temperature of the exhaust gases of a boiler; and at the same time, the heat exchange efficiency of the air preheater can be reduced manually according to the change rule of the metal temperature of the heat storage plate of the air preheater so as to prevent low temperature corrosion and dust blockage of the air preheater.