Abstract: This paper reported the hydrochemical characteristics and possible source through the correlation analysis, factor analysis and enrichment factor in the Buha River Basin in wet season in 2014. The results showed that the pH of river water in Buha River Basin ranged between 7.91 and 9.21, with an average of 8.43. The EC ranged from 133 to 871 μS·cm^-1, with an average of 383 μS·cm^-1. The average ionic concentrations for SO₄^2-, Ca²⁺, Cl^-, Na⁺, Mg²⁺, NO₃^-, K⁺ and NH₄⁺ were 60.2, 33.1, 31.1, 14.8, 12.8, 8.1, 1.5 and 0.3 μeq·L^-1. The ionic abundance of river water in Buha River Basin followed the sequence of Ca²⁺> Na⁺> Mg²⁺> K⁺> NH₄⁺ for cations, and SO₄^2->Cl^->NO₃^- for anions. The concentrations of Mg²⁺, Ca²⁺ and SO₄^2- increased with the increase of altitude, whereas the concentrations of Na⁺, Cl^- and NO₃^- decreased. The concentrations of K⁺ and NH₄⁺ showed no change along the altitude. The chemical type for river water was SO₄^2--Ca²⁺-Cl^--Mg²⁺ type. The water chemistry of Buha River Basin was mainly controlled by evaporates and carbonates weathering products.

Key words: stable isotope, trophic level, Dalian marine area, food web.