Abstract: Land use monitoring, assessment, early warning are the technical basis to ensure the rational allocation of land resources. According to summarizing research status of land use early warning, the paper proposed a general idea of research on land use early warning from three aspects of farmland protection, saving and intensive use of construction land, ecological security to towns and villages for the main study objects. Based on existing research results, the indicators of land use early warning system were built, and the methods of indicator values acquisition, early warning model selection and warning degree range delineation were studied. Finally, taking the Fangshan district of Beijing as empirical study area and using the former study results, farmland warning in 2015 was predicted. Part of the town of Fangshan district in 2015 may be more serious on land use warning. The results show that the early warning system has the functions of dynamic and real-time monitoring and warning for land use, and is an effective means to protect the reasonable use of the regional land and reduce the waste of resources.