The submerged soil may dissolve in water and influence water quality when a reservoir begins to run. the Laohutan Reservoir in Taihu Lake basin is taken as an example. In order to study the dynamic features of reservoir water about p H, DO, COD_Cr, BOD, nitrogen, phosphorus, and fluoride within 60 days,after taking samples from bamboo soil, paddy soil, and natural water on site, a simulation experiment is carried on. Results reveal that soaking bamboo land and paddy field soil lead to the reduction of the pH and DO in water and however, the contents of COD_Cr, BOD, nit rogen, phosphorus, and fluoride are increased. Compared to the paddy soil, bamboo soil impacts reservoir water quality more seriously. This is why we recommend taking corresponding treatment measures for bamboo soil .