In order to study the effect of dust on the optical efficiency of solar concentrator and the distribution of energy flow in metal tube, the influence of dust on the optical efficiency of the condenser is analyzed theoretically and the dusting conditions of the trough solar concentrator are simulated. Moreover, by analyzing the heat transfer of the parabolic trough collector system using the Monte Carlo ray tracing method and the finite element volume method, the energy flux density and circumferential temperature distribution (CTD) are generated. The results show that the accumulated dust has significant effect on the direction of reflected light and the energy flux density of the metal tube wall surface, and the distribution of the flow density of the wall by the dust has certain influence on CTD. According to the influence of CTD on the parabolic trough collector system, a new method is put forward that a secondary homogeneous reflector is added based on traditional parabolic trough collector system. The addition of the secondary reflector makes the energy flux distribution of the metal tube tend to be uniform and CTD of the metal tube of the new parabolic trough collector system reduce significantly, thus reducing the dust accumulated effect on the spot solar collector system. This method provides some reference for the optimization of parabolic trough solar concentrating systems.