Abstract: The evolution of warm front circulation and occurrence of condensation in the upper level westerly jet and low-level southerly jet are simulated by using a primitive equation mode1 including moisture condensation process.The calculation results show that the moisture condensation plays a very significant role on warm front circulation and may be an important mechanism to excite strong mesoscale deep convection in the warm frontal zone.In the moist atmospheric model with moisture condensation process the effects of low-level southerly jet on the warm front circulation are much larger than the upper-level westerly jet and are more important factors for exciting strong mesoscale precipitation in the warm frontal zone while in the dry case,as opposed to the moist case,the influences of upper-level westerly jet on the warm frontal circulation are much larger than the low-level southerly jet.A combination of the upper and low-level jets has important effects on formation of multiple mesoscale frontal rainbands in the moist warm frontal zone.