In the condition of navigation war, civil or indoor environment, when the visible satellite number is less than 3 and users’ position is unknown, one-way timing solution is no longer unavailable. Based on the characteristics of Chinese navigation satellite system such as COMPASS and CAPS, a doppler positioning timing method based on IGSO satellite is proposed. By measuring the doppler frequency shift and counting the integral Doppler, the user position and time are computed. Analysis result shows that the positing and timing usability can reach nearly 100% in Chinese domain when using 3 IGSO satellites with transponders. The position precision can achieve 3m and the timing error is less than 100ns for static users with long time measurement. Because only one IGSO satellite is needed and there is no requirement for demodulating navigation message, this method provides a novel timing method for the navigation war background and weak signal environment. 