Based on the measured concentration of ammoniacal nitrogen( NH4+-N ),nitrate nitrogen( NO3--N )and total phosphorus(TP)in Ganjiang River in January and June 2013,the distribution characters and pollution sources of NH4+-N,NO3--N,TP and their influencing factors are analyzed. The results show that the mean concentration of NH4+-N and NO3--N were higher in the dry season than that in the wet season without statistical significance,while the mean concentration of TP was significantly higher in the dry season than that in the wet season. The concentra-tion of NH4+-N had higher value in the downstream of Ganzhou City and Nanchang City. The concentration of NO3--N in mainstream had higher value in the downstream of Ganzhou City and Nanchang City in the dry season,but in the wet season,the difference of NO3--N concentration in mainstream was small. As for the tributary,Taojiang River and Yuan River had higher concentration of NO3--N. The concentration of TP had a series of high value in the downstream of Ganzhou City and Nanchang City in the dry season,while in the wet season,this only appeared in the downstream of Ganzhou City. By studying the temporal and spatial distributions of nitrogen and phosphorus nutri-ents,together with the correlation test between NH4+-N,NO3--N,TP and Cl-,it was found out that the main pollu-tion source of NH4+-N was urban sewage,and the main pollution source of NO3--N was urban sewage in the dry sea-son,however,both urban sewage and agricultural drainage played an important role in the wet season. As for the pol-lution source of TP,urban sewage came first,followed by agricultural drainage.