In this study, Larix gmelinii forest burned areas were experienced in different forest types. The natural regeneration conditions, community structure characteristics, species composition, community biodiversity were observed and researched in 2015. The results showed that: the alpha diversity index of community each layer in different forest types showed a ranking of herb layer > shrub layer > tree layer. After twelve years, the Simpson and ShannonWiener indices in herb layer in 3 different forest types burned areas are less than that of unburned area and showed a ranking of 2003SG>2003SL>2003SR, while the indices of burned areas in the shrub layer are greater than that of unburned area and showed a ranking of 2003SG>2003SR>2003SL.