Overview the landslide monitoring and early warning researches achievements from three aspects as the rainfall thresholds, monitoring techniques, and regional monitoring and early warning system. Firstly, it summarized the landslide rainfall thresholds of 28 countries or regions in the world including their study or statistic methods. Day rainfall model, antecedent rainfall model and soil moisture content model almost cover all rainfall thresholds calculation methods. On the other hand, due to the complicated water infiltrating and triggering types, different mechanism landslides “need” different thresholds. Study of coupling rainfall to water seepage to soil strength is the trends in the future. The monitoring techniques can be divided into four kinds as the displacement monitoring, physical field monitoring, underground water monitoring, and trigger factors monitoring according to the monitoring objects. It also can be divided into three kinds as manual monitoring, simply equipped monitoring and professional monitoring according to the monitoring devices. At present, the domestic monitoring techniques are closed to foreign countries. Some professional monitoring equipment has become very common. It's limit application only because of the high price. Some new technology such as InSAR, three dimension laser scan can be utilized in the landslide monitoring quickly. The data collecting comes to automatically remote control and monitoring system has a Web—GIS trend. People can design a set of early warning level through combining the susceptibility or hazard zoning map and the rainfall threshold. Installing certain amount of rain gage, plus the forecast rainfall, it can do the landslide early warning then. It is the routine method on regional rain triggered landslide warning whatever domestic or overseas. This kind of early warning played an important role especially on public alert, but it is difficult to warn individual landslide effectively. Landslide monitoring and early warning projects were implemented in China in many places in recent 10 years and got great achievements. But according to the statistic data, the successful warning rate is not so high. One hand is the rate of professional successful alert to total successful alert is very low; another hand is many landslides occurred outside the alerting zone. So the bottleneck problem of restraining the effectiveness of monitoring and early warning is the potential landslides identifying which is the basis of all other measurements. The way to resolve it is to study the landslides regional development regulars to find the effective identifying technology for the potential landslides, and to bring the landslide risk management conception into it, so can distribute the monitoring resources reasonable and to warning effectively.