Abstract: Position measurement methods by use of phase detection and amplitude detection based on inductosyns are not suitable for high speed and high accuracy position measurement for the defects of operation principle. To solve the problem of measuring position accurately at high speed, a novel position measurement method based on inductosyns was given, which makes use of amplitude fine division means. The inductosyn’s output signal is an amplitude modulation signal and its amplitude is small. To use the amplitude fine division method, the inductosyn’s output signal should be amplified with no distortion. After showing the operation principle, a block diagram of the position measurement system was given. Experiment and simulation of function circuits was performed. The results prove that this method cancels the effect of the dynamic variables in the inducting signals out of inductosyns on position measurement, overcomes the shortage of current methods which can only measure position with low accuracy and low speed, can measure position with high accuracy, equal time interval in high speed moving conditions, etc.