Glassland soils are mainly developed under steppe, praire and forest-steppe vegetation. Most of them are Isohumosols based on the diagnostic horizon, Isohumosols are mineral soils that have a mollic epipedon (dark-colored surface horizon), with base saturation determined by NH4OAc method higher than 50 percent and Isohumic property. The total estimated area of Isohumosols is 9 million km2 in the world and 0.76 million km2 in China. As reclamation of Isohumosols the organic matter content decreases quickly at the first stage, and then slow down corresponding with local bio-climate environment. In order to reserve the organic matter in Isohumosols, it is necessary to prevent soil erosion and adopt reasonable cultivation.