Abstract: Two kinds of pretreatment methods, i.e. liquid-liquid extraction (LLE) and solid phase extraction (SPE) were used to extract the organics of the river samples from the Leptomitus lacteus growing places in high-occurred season. GC-MS was then used to analyze the pretreated samples qualitatively and semi-quantitatively. The results showed that 92 kinds of organics, which GC-MS peak area ratio is greater than 0.07%, were detected, and they were organic acids, phthalate esters, hydrocarbon compounds, organic acid esters, heterocyclic hydrocarbons, polycyclic aromatic hydrocarbons, ketones, phenols, alcohols and unknown organics. The content of 26 kinds of organics was high and their GC-MS peak area ratio was higher than 1%. The 26 organics were organic acids, hydrocarbon compounds, phthalate esters, other esters and unknown organics. It was indicated that no toxic organics pollution occurred in the Leptomitus lacteus growing river reach in February.