Abstract: The characteristics of quasi-balanced and unbalanced vertical circulations are diagnosed by applying the PV-ω equation system to a high-resolution simulation of Typhoon Nari (2001) in order to gain insight into their relative roles in organizing process of deep moist convection in tropical storms. Results show that quasi-balanced flows represent well the organized circulations in the storm, most of which are associated with latent heat release. Weak updrafts in the eyewall, induced by the low-level dynamic convergence, help trigger deep moist convection in its cyclonic flows, whereas the subsidence, induced by the upper-level dynamic forcing, counteracts the latent heating-induced updrafts, restraining the upward extension of vertical motion. The spatial and temporal distributions of short waves indicate that the unbalance flow is nonstationary and associated with the dispersion of gravity-inertial wave. It is found that when the low-level weak updrafts caused by the quasi-balanced dynamic forcing are intense enough, the release of latent heat results in the superimposition of quasi-balanced and unbalanced updrafts, which form the strong updrafts in the eyewall. This process, together with the compensating and adjustment processes of unbalanced flows, plays important roles in organizing deep moist convection in tropical storms.