We study into the sliding mode control of Itô-type stochastic time-delay system with distributed parameters,design the variable structure controller and verify the existence of sliding-mode movement in this paper.At the same time,the invariable property and moving stability are analyzed for sliding-mode control system with uncertain variables on sliding switching surface.Compared with previous studies in this aspect,the conclusion achieved in this paper is correlated with diffusion coefficients and thus has significance in practical application.Conclusions of many similar papers can be improved and extended by using methods proposed in this paper.