In recent years, the toe-shooting method is widely applied to handling soft foundation of many offshore engineering projects such as building breakwaters, shore protections and reclamation of land from the sea as a commonly method. We analyze the impact on adjacent waters resulting from the blasting in the foundation of simulating the transport and diffusion process of the suspended sediment caused by toe-shooting method applied to the promotion and reclamation project located in Daishan. The result shows that the transport and diffusion of suspended sediment are predominantly affected by the current movement, the direction and scope of the former are determined to a great extent by the direction and dynamics of the latter. The content of suspended sediment rapidly decreases as a result of diffusion and silting. The content increment could basically reach the level below 10 mg/L within 3 hours after the blasting. The blasting has some impact on water environment of neighboring waters, but the duration is limited and the incidence is limited too.