Peatland of Yangmu in Mishan region is located at 45°34′N,132°23′E. 5 spore pollen zones are divided throngh the spore pollen analysis. The change process of paleovegetation and paleoclimate was obtained. Warm-inclined broad-leaved forest predom inated in the environment of warm climate with a little dry climate before 3400 a B.P..Deciduous broad-leaved and conferous mixed forestpredominated,in which Pinus, Picea and Abies were main speries,together with wet meadow in the environiment of the cool and wet climate during 3400～1940 a B.P..Deciduous broad-leaved and coniferous mixed forest predominated in the environmentof dry and warm climate from 1940 to 1090 a B.P..Broad-leaved forest was predominant,and the climate was the warm and wet from 1090～545 a B.P..Bog m eadow predominated when the climate changed to cool and dry from 545 a B.P.. The compostion of the upper part of the 143～125 cm peat profile presented the cold period in the early of Christian era through the mutual identification between the records of historical material such as spore pollen,magnetization rate,organic matter,and archaeology study.The composition of the parts of 125～85 cm and 85～38cm presented the warm climate in Nan Bei Dynasty and Sui-Tang Dynasty.Since 3400 a B.P.for the reason of frequent human activites in Mishan region,the amunt of cultural relics in Sui-Tang Dynasty increased,which represented thatancient man took much more woods from the forest,while it was in an environment of warm climate.