Abstract: Assisting the natural regeneration of Larix gmelinii is a major measure to rehabilitate the forest vegetation of Greater Xian mountains after big forest fire. In this paper,the germination condition of assisting Larix gmelinii natural regeneration was analysed.The emergent frequency and density of Larix gemlinii seedlings after one year of assisting regeneration were largely related to seed year. The best regeneration results of seedlings came from the assistant measures in the seed year,and the emergent frequency and density of Larix gmelinii seedling reached to 70% and 1000-2000 sedlings·ha^-1,respectively.The regeneration effects also related to site type,seed source,and soil preparation.In general,a good assisting result of Ledum plastre-Larix gmelinii and Moss-Vaccicum vitis-i-daea-Larix gmelinii forests can be found at middle and lower parts of slope and the regeneration frequency can be up to 60- 70%.Most regeneration seedlings of Larix gmelinii were appeared on the naked,moist topsoil.The relationship between regeneration frequency and vegetation cover clearly showed a negatively exponential curve.The effective distance of mother tree wall was less than 60m.

Key words: Natural regeneration, Larix gmelinii, Plant cover