Abstract: A method for improving the solar energy condensation efficiency in the solar energy condensation electric power facility is provided. A corresponding twice condensing prism (11) is provided under a condensing lens. A corresponding solar cell is provided under the twice condensing prism. Reflective mirrors (21) are provided around the twice condensing prism. The twice condensing prism is provided in the reflective mirrors. The central axis of the twice condensing prism and the reflective mirrors are coincided. The distance between the normal line of the plane of the light incidence of the twice condensing prism and the reflective mirrors is greater than the distance between the normal line of the plane of the light emergence of the twice condensing prism and the reflective mirrors. The method can uniform the solar energy condensation, and improve the tolerance of the twice optical system.