The cloud top height (CTH)of low clouds over western North Pacific is an important parameter in climate research and meteorological disaster monitoring． Satellite data are commonly used to obtain the low cloud CTH with a wide range and continuous changes，but its products have large deviations from the actual low cloud CTH． Therefore，based on the observation phenomenon that the cloud top of low clouds is generally located at the bottom of the low-level temperature inversion layer，a method of retrieving the low cloud CTH from the atmospheric vertical profile data of FY-4A satellite (called “temperature inversion rnethod”)is proposed，and it is applied in the retrieval study of low cloud CTH over western North Pacific． Using the low cloud CTH detected by the spaceborne lidar CALIPSO (Cloud- Aerosol Lidar and Infrared Pathfinder Satellite Observation)，the CTH product (CTH_AGRI)of FY-4A satellite and the low cloud CTH results (CTH_GIIRS )obtained by the temperature inversion method in this paper are verified over western North Pacific． The results show that both results of CTH_AGRI and CTH_GIIRS are significantly lower than those of CALIPSO，with a difference of -0. 49 km and -0. 27 km， respectively． It is also found that the low cloud CTH retrieved in this paper is closer to the detection result of CALIPSO and is superior to the CTH product of FY-4A satellite．