For the multi rotor aircraft with high model order, a control strategy based on dynamic surface back-stepping is putted forward to solve the problem that the derivation of the virtual control input signal is complicated when conventional back-stepping approach is used. First, the mathematical model of multi rotor aircraft is established. Then, dynamic surface back-stepping that the low pass filter is introduced into the controller design to solve the problem of computational expansion is presented, and the Lyapunov stability analysis of the designed controller shows that it is stable and exponentially convergent. Finally, simulation results show that this approach is superior to the conventional back-stepping approach.