Abstract: This paper, basing on forest type map and forest management survey database of 1989 and 2006 and on a GIS platform and the software of FragStats, calculates the index of landscape pattern，and systematically analyies the dynamic character of the landscape spatial structure of Mengjiagang Forest Farm Heilongjiang Province with the method of landscape index. The result indicates that with the landscape elemental types of the study area increases, and landscape diversity index and landscape dominance increases, the fragment index and isolation index of forest landscape increases. Larix gmelinii（Rupr.）Rup is the dominating landscape element type in this region, but its landscape dominance is decreasing gradually, so the result implies that L. gmelinii（Rupr.）Rup landscape element translate into other landscape elements. This paper firstly applied with landscape internal structural index analysis the dynamics of forest landscape of Mengjiagang Forest Farm, and the result implies that Broad-leaved forest and Mixed forest landscape were mainly made of mature and overmature age. Three main coniferous forest landscape elements are mainly made of middle age and near-mature age. Human activities are the main influence factor on forest, which accelerate the simplification of age structure of coniferous forest.

Key words: forest landscape, dynamics of landscape, landscape internal structural index