Abstract: Potentilla froticosa is a most representative alpine deciduous shrub in Qilian Mountains. The growing process of the shrub plays an important role in ecosystem services. In the growing season of 2015, we observed leaf traits of P. froticosa and measured its hyperspectral reflectance by ASD in different phenological phases. The results showed that leaf area, leaf area index (LAI), green leaf area index, chlorophyll content (SPAD values) increased from the beginning of the growing season, reaching their peak in the first half of August, and then declined in the end of the growing season. The change trends of reflection spectrum waveform curve of P. fruticosa shrub in different phenological phases were similar. The correlations between the vegetation indexes (NDVI, EVI, and CI_{red edge}) and LAI, leaf SPAD value were significant (P<0.05) or extremely significant (P<0.001). The relationship between EVI and LAI was the best, and the relationship between NDVI and leaf SPAD value was the most stable. According to the regression analysis, statistic models were built to estimate the LAI and leaf SPAD value considering vegetation indexes in different phenological phases. It is concluded that the LAI and leaf SPAD value can be indicators of plant growth state, and we can monitor the growing process of P. froticosa by the EVI and NDVI derived from remote sensing data at regional scale.