Abstract: The zonal vegetations of the semiarid Gonghe Basin are desert steppe and steppe type. The trends of the developmental and adverse processes of desertification, due to the long period of climatic fluctuation, are fully decided dy human factors at present. The interaction of atmosphere, biosphere and lithosphere results in the marked characters of various developmental or adverse stage of desertification, of which vegetation is the most sensitive and intuitional feature. Therefore, the discussion about series and law of vegetation succession is essentially the study of developmental and adverse processes of desertification.