Urban geo-environment mainly concerns those regards in and around a city, such as the movement of earth crust and earth surface, conditions of hydrology, geology, geography and meteorology. The relevant studies on geo-disaster reduction and the influences resulted from human activities on the geo-environment are included as well. It is stressed in the paper that geo-environmental protection and management, as well as mitigation of the vulnerability of big cities again the geo-disaster are of significance to the sustainable development for Chinese cities.