Abstract： A novel method for measurement of incylinder pressure signal is proposed in this paper. There is no  need to install angle encoder at the free end of the engine but to install pulse sensors at flywheel end to obtain wheel gear signal. The cylinder pressure and wheel gear signal are sampled using the high speed internal clock data acquisition card. The zero crossing points of wheel gear signal are calculated using the Newton interpolation algorithm. Based on the assumption that the instantaneous speed of engine is unchangeable during adjacent gears, the cylinder pressure measured in the timedomain is converted to the angledomain using the interpolation algorithm. The method is verified by an experiment, and results show that the method is reliable and able to fulfill the requirement of combustion analysis.