The optical software TracePro was used to study the influence of the cone angle of reflection cone installed on the top of the cavity of compound truncated cone heat absorber on the optical performance of the heat absorber.At the same time, the influence of the distance between the aperture of the heat absorber and the focal plane of the parabolic concentrator dish and thickness of quartz glass plate on the optical performance of the heat absorber was discussed.The simulation results show that, when the reflection cone radius was 50 mm and the cone angle was160°, the optical performance of the compound truncated cone heat absorber was the best.For the quartz glass plate of different thickness, when the distance between the aperture of the heat absorber and the focal plane of the parabolic concentrator dish was changed, the luminous flux of the surface with tubes and the system optical efficiency were normally distributed, when the distance was-3010 mm, the thickness of quartz glass plate had little effect on the luminous flux of the surface with tubes and the system optical efficiency.The research could provide a theoretical basis for the design and optimization of dish solar heat absorber, and lay a foundation for the study of heat transfer performance of heat absorber.