The impact and damages of landslide hazards on human and social economy have become more and more seriously. Landslide hazards triggered by heavy rainfall take 90% of the total amount. A review on the landslide researches is made, such as, its forecast method, its forecasting and warning, its temporal and spatial distribution, its mechanics induced by heavy rainfall, stability theory, application of GIS. Modern mathematics and physics theories have been comprehensively applied in landslide forecast, which gained quickly development for recent two decades. 3S techniques have been used to monitor and prediction of landslide, but further potential dominance should be developed. Combining degree between mechanism research and regional statistics is dissatisfied,which is necessary to have a breakthrough. Because of its local, dispersed feature and instability due to lacking sufficient data, which should be deeply discussed, the development of regional warning model is therefore emphasized. Survey of water content and pore water pressure in soil body should be more precision and available. Real-time Forecasting and Warning System of landslides based on Web-GIS need to be built for quickly getting data during extremely heavy rainfall.