Abstract: In order to solve the paddy field subsidence and failure caused by the coal mining subsidence in the southwest part of China, to recovery the water holdi ng capacity of the water insolated stratum for the paddy fields in the mining subsidence area and to reconstruct the water insolated stratum in the soil, ground radar and high density electric method were applied to the site exploration.In combination with the regional features, the failure features of the paddy field subsidence area were i nvestigated.The paddy field failure way and the water leakage features of the paddy field in the mining subsidence of Southwest China were summarized.The water lea kage mechanism was analyzed.The results showed that the mining subsidence in Southwest China would cause the underground water dropping, the surface ground cr acking and others.The paddy field failures in the mining subsidence area would have the subsidence field, water leakage field and land cracking field.The site investigat ion and the exploration held the coal mining subsidence affected to the water keeping function of the paddy field insolated stratum would be the main reason to cause t he paddy field water leakage in the subsidence area.