Based on the mass transfer theory, a new mass transfer model of ion-exchange process on zeolite under liquid film diffusion control is established, and the kinetic curves and the mass transfer coefficients of NH4+-K+ ion-exchange under different conditions were systemically determined using the shallow-bed experimental method. The results showed that the NH4+-K+ ion-exchange rates and transfer coefficients are directly proportional to solution flow rate and temperature, and inversely proportional to solution viscosity and the size of zeolite granules. It also showed that the transfer coefficient is not influenced by the ion concentrations. For a large ranges of operational conditions including temperatures (10-75 degrees C), flowrates (0.031 ms(-1) - 0.26 ms(-1)), liquid viscosities (1.002 x 10(-3) Nsm(-2) -4.44 x 10(-3) Nsm(-2)), and zeolite granular sizes (0.2 - 1.45mm), the average mass transfer coefficients calculated by the model agree with the experimental results very well.