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In this paper we construct the asymptotics of the solution of the singularly perturbed parabolic problem with the stationary phase and the additive free term by using the regularization method for singularly perturbed problems. In this case, the asymptotic solution consists of regular and boundary layer terms. The boundary layer members are parabolic, power and rapidly oscillating boundary layer functions, and their products. These products are called angular boundary layer functions. Angular boundary layer functions have two components: the first is described by the product of a parabolic boundary layer function and a boundary layer function, which has a rapidly oscillating change.

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The aim of this work is to construct regularized asymptotic of the solution of a singularly perturbed parabolic problems. Namely, in the first paragraph, we consider the case when the scalar equation contains a free term consisting of a finite sum of the rapidly oscillating functions. In the first paragraph, it is shown that the asymptotic solution of the problem contains parabolic, power, rapidly oscillating, and angular boundary layer functions. Angular boundary layer functions have two components: the first one is described by the product of a parabolic boundary layer function and a boundary layer function, which has a rapidly oscillating change. The second section is devoted to a two-dimensional equation of parabolic type. Asymptotic of the scalar equation contains a rapidly oscillating power, parabolic boundary layer functions, and their product; then, the multidimensional equation additionally contains a multidimensional composite layer function.