The characteristics of forest floor in Liupan Mountain was studied.It was found that the herbage diversity in the forest of Larix principis- rupprechtii, Betula platyphylla, and Pinus tabulaef ormis was abundant.Due to the fleshy leaves of Quercus Liaotungensis forest, litter layer was rather loose after litter was decomposed, so that litter depth was the greatest and litter biomass was lower than that in Larix p rincipis- rupp rechtii forest.Furthermore, the leaf litter was the main configuration.Ratio of litter biomass to litter depth in undecomposed layer was greater than that in half?decomposed layer, while in September, the ratio in needle forest was the greatest.There was more complicated forest structure in Quercus Liaotungensis as litter can be supplied continuously but be decomposed rapidly.This supplied soil nutrients and at the same time, a looser litter layer formed in soil surface.The most evident change occurred in the litter of Quercus Liaotungensis forest.