Based on the hydrochemical data of water samples from the Dongjiang River Basin in dry and wet seasons

the mechanism of river electrical conductivity (EC) is considered. The results show that EC in the Dongjiang River Basin is 85.3 μS/cm in January and 87.7 μS/cm in July. The share of weathering conductivity (

C

w

)

seasalt conductivity (

C

s

) and anthropogenic conductivity (

C

h

) is 46.4%

19.6% and 33.9% respectively. It indicates that chemical weathering is the main contributing factor for EC in the Dongjiang River Basin. The humanity interference cannot be neglected

while the seasalt settlement has certain effects on the hydrochemistry. Furthermore

the nonparametric statistics methods and spatial analysis are used to prove that the geographic features (lithology

landform

soil

vegetation and human activities) have played an important role in the EC mechanism.