The particle tracer method is applied to investigate both the solid flow state and the solid velocity distribution under different superficial gas velocities and times in the gas-solid concurrent/counter-current intermittent moving bed. The quantitative analysis is made and the calculation formula of the solid velocity is also established. The results show that, an approximate V-shaped distribution is presented in the particle tracer layers, which indicates that the horizontal distribution of the solid velocity is in the form of the "slow-fast-slow". Moreover, the variation of the solid velocity distribution is more obvious with the passage of time. Different from the gravity condition, the interaction between the gas and the solid phases is more complex under both the concurrent and the counter-current conditions. At the same time, with increasing superficial gas velocity, the variation range of the solid velocity distribution increases in the concurrent moving bed; while it decreases in the counter-current moving bed. Besides, at the same height of the particle layers, with increasing superficial gas velocity, the width of the flow area increases in the concurrent moving bed, and both the inhomogeneity index of the flow time and the percentage of solid flow dead zone decrease, which indicates a more uniform solid velocity distribution appears under concurrent condition. However, it is opposite in the counter-current moving bed. Based on the widely used solid velocity model of particle kinematic model (PKM) in the silo, with the introduction of both the Reynolds number Re and the Stehar number St, the calculation formula of the solid velocity is established under both the concurrent and the counter-current conditions in this work. It is anticipated to provide a reference for the operation and design of the gas-solid concurrent/counter-current moving bed.