Based on the analysis of the reasons for land desertification in eastern surface hills of Erhai Lake, the paper discusses the type, distribution and area of the desertification land.

Holes and pore space of limestone, heavy rainfall, soil loss, the topography of slope and the destroy on forests imposed by humankind were the main causes of lithification in karst area.

The main reasons of Karst rocky desertification formation are the artificial unreasonable activities and frail ecological environment in the Karst mountainous area according to the research results.