Ammonia-nitrogen adsorption process and characteristic were studied on the compound modification zeolite granules, which were made by zeolite power and modified by NaOH solution, NaCl solution and roasting successively before granulation, and with the size of Φ1.50 mm×2.50 mm. Isothermal equilibrium adsorption, adsorption kinetics characteristic，adsorption rate control steps and adsorption thermodynamics were main investigated in different conditions respectively. The results showed when PH value was equal to 7.00 and adsorption temperature was 298 K, ammonia-nitrogen adsorption process of the zeolite granules conform to Langmuir adsorption isotherm, the fitted equation was y=0.0084x+0.2857 and the correlation coefficient (R2) was 0.9936. Pseudo?second order reaction kinetics equation can describe the adsorption kinetics characteristics and the fitted equation was y=0.3401x+8.9684 and the correlation coefficient (R2) was 0.9993. Beside, the ammonia-nitrogen adsorption process was mainly controlled by film diffusion (y=0.0172x, R2=0.9809) in whole process and controlled by which and intra-particle diffusion process (y=0.0869x+1.4917, R2=0.9798) in 60 min later together. In addition, adsorption thermodynamics showed that ammonia?nitrogen adsorption process of the zeolite granules belong to spontaneous process, adsorption rate quicken with temperature rising. The adsorption process also belong to endothermic process, adsorption capacity increase with temperature rising. Entropy effect was the main driver of the adsorption process.