This paper numerically simulates flow and concentration fields in a supersaturated liquid in front of the solidification front during freezing. The supersaturated liquid usually produces bubbles. This phenomenon often occurs in different fields, for example, heat transfer, manufacture, biochemistry , etc. The research is based on micro theory to analyze different phenomena of a single bubble, which involve the unsteady interactions between flow and concentration fields, and rising and resistance forces etc. The results contribute to an improved understanding of bubble dynamics generally encountered in technological industries.