Abstract: Monitoring the planting area and growth status of rare medical herbs is a new direction of remote sensing application. Pseudo-ginseng, as a commercial and severe planted crop in Yunnan Province, has a significant influence on the regional land use and financial income. Thus,the accurate monitoring of the planting area and the trend of pseudo-ginseng is of vital importance. Based on the analysis of spectral and spatial features of the pseudo-ginseng plantation, an efficient method to extract the planting areas of pseudo - ginseng was proposed and its change was analyzed using multi -temporal remote sensing images. Experimental results demonstrated that the planting area of pseudo-ginseng in Wenshan and Honghe has kept grown from 2010 to 2015,especially from 2012 to 2014 with a rapid speed. However,the market price decreased because supply exceeds demand in this period. Compared to the market price, the planting area has a obvious lag effect. Furthermore, the pseudo - ginseng plantation is concentrated in the appropriate elevation gradients between 1400 and 2000 m, with the slope below 25°.