On basis of radio carbon isotope and stable carbon isotope test on samples from the Longli alpine meadow, Guizhou Province, it is figured out that ages of the samples in 0.90 m and 0.55 m of the peat layer bottom are (7, 933±33) a B.P. and (7, 733±28) a B.P., respectively and rate of peat layer accumulation is 1.75 mm/a. The δ¹³C of the peat layer, ranging from -28.9‰ to -26.6‰, with average value of -27.8‰, illustrates that C₃ plants are the primary vegetations, which is similar to the flourishing moss on the modern platform marsh. Compared with the climatic data of other areas, we infer that the peat here grew in relatively warm moist climatic environment, and the peat layer was the product formed in the first warm and humid period of the big warm period in Holocene.oft-com:office:office" />