Because traditional blind source separation method required more sensors to obtain measuring signals than the amount of source signals, accuracy separation signals con be achieved if the source signals are stationary and independent. But the engine cylinder head vibration of non-stationary signals has more motivation sources, so the condition cannot be satisfied. In order to get separation signals, single-channel source separation method based on order filtering is proposed. The frequency of the combustion pumping signal goes with rotational speed frequency as prior information. Order components are gotten through order filtering. The new observation signals are built up by order components and initial signals. And then the separation signals of cylinder head non-stationary vibration are gotten through fast independent component analysis. This method is effective through the result of simulation and experiment research.