abstract: Rouse model is a theoretical framework designed to describe the dynamics of a polymer in dilute solution. In this talk, a variant of Rouse model, reflected Rouse model, is introduced in an attempt to explain "reptation" in polymer dynamics and is formulated into Reflected Stochastic Partial Differential Equations (RSPDE) in domains in R3. Existence and uniqueness problems in the upper-half space of R3 are discussed.