Mt. Jiujiufong experienced a series of extensive landslides after the 921 Earthquake occurred on September 21, 1999. A unique geographic feature and active plant succession have been observed at several landslide locations. This study found that the soil condition was worse but the species diversity of VAMF was higher at the study plots of the crest line than those at the valley. Numbers of VAMF species and their spores decreased progressively with decreasing in the pioneer plants during the study period. Eventually, Pinus taiwanensis became the predominant pioneer plant in the crest line, and VAMF's Scutellospora nigra spores were found in its rhizosphere.