Abstract: Organic acids exudation from the roots of Chinese fir (Cunninghamia Zanceolata) and Masson pine (Pinus massoniana) seedlings under low phosphorus stress was studied with solution culture method. The results revealed that organic acids exudation from the roots of Chinese fir and Masson pine seedlings under low phosphorus stress increased. Compared with P3(KH2PO4, 0.5 mmol/L), the average organic acids exudation from the root of Masson pine seedling under P, , (KH2PO4, 0 mmol/L), P~ (KH2PO4, 0.03 retool/L) and P2 (KH2PO4, 0.09 rnmol/L) increased 328.6~, 267.9~ and 126.40//00 respectively. Masson pine from Zhejiang province had the highest organic acids exudation. Under the low phosphorus stress, the kinds of increased organic acids exudation from the different provinces of Chinese fir and Masson pine were different. Masson pine from Zhejiang province mainly increased oxalic acid, tartaric acid, citric acid and malic acid exudation, from Guangxi Province mainly increased oxalic acid and tartaric acid exudation, from the Guizhou Province mainly increased oxalic acid, tartaric acid and malic acid exudation. Chinese fir mainly increased oxalic acid and tartaric acid exudation.