The strengthened removal of natural organic matters was an important object for the technology of drink water treatment. The circulating granulation fluidized bed, as a new type, but effective technology for separating solids from liquids, was the characteristic of a high load of treatment and a strong adaptability to different water qualities. Combining this fresh technology with powdered activated carbon (PAC), the strengthened removal effect of organic matters in the water of reservoirs was studied. It was discovered that when the PACl and PAC were using together, and when the dosages of PACl, PAM and PAC were 24mg/L, 1.2mg/L and 30mg/L, the removal rates of the turbidity, UV₂₅₄, COD_Mn and DOC of water input in the fluidized bed system were 96.5%, 72.0%, 71.7% and 61.0% respectively. Through the three-dimensional fluorescence analysis of organic matters during the water inflow and outflow, it was noticed that, in this fluidizedbed system and under the effect of coagulation and granulation, the FI of fulvic acid and humic acid during water outflow were lowered by 40.1% and 43.0% as against the water inflow, after PAC was put in of 30mg/L, the FI of fulvic acid and humic acid during water outflow were lowered by 54.0% and 55.3% as against the water inflow. The molecular weight of the organic matters in the water of reservoirs lay chiefly between < 1kDa and 10~30kDa, accounting for 37.1% and 39.1% of the total weight of organic matters respectively. In the circulating granulation fluidized bed system, the effect of coagulation and granulation was intended to remove the organic matters in range of 10~30kDa, and the organic matters of < 1kDa could be removed comparatively better due to the adsorption by adding PAC.