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The effect of strain energy on pre-precipitation phase in Ni75Al15V10 alloy was studied using the microscopic phase-field method. It is found that the initial state of strain energy in the alloy has an effect on precipitation of L10 phase. L10 phase does not precipitate unless the effect of strain energy is considered. The larger the strain energy is, the shorter the nucleation incubation periods of L10 phase are, and the more obvious the characteristics of precipitated L10 phase are. Meantime the volume fraction and the lifetime of precipitated L10 phase also increase as the strain energy increases. When the strain energy is small, L10 phase precipitates in some areas of the disordered matrix firstly, and then the transformation from L10 to L12 phase occurs; however, in other regions L12 phase precipitate directly. When the strain energy becomes larger, L10 phase precipitate in most areas of the matrix, followed by part of these L10 phase dissolving, and the undissolved L10 phase would transform into L12 phase finally.