Abstract: In this paper, we study the partial regularity of solutions to the heat equation. The resulting partial Schauder estimates have a unified integral-typed expression, from which the known interior Schauder estimates can be derived when the nonhomogeneous term f(x,t) is Lipschitz continuous, Hölder continuous or Dini continuous respectively in a certain direction. In particular, when f(x,t) is Hölder continuous in the direction x_n, so are the mixed derivatives u_xxn with the same Hölder index.

Key words: Heat equation, Partial regularity, Partial Schauder estimates