Abstract: This article designs a Fresnel line concentrating heat collection system based on a triangular cavity receiver,by building a testing platform,the impact of several factors such as with or without a transparent cover on the cavity,the presence or absence of black paint on the surface of the copper tube inside the cavity,and direct solar irradiance on the outlet temperature of the cavity and the heat collection efficiency of system under actual weather conditions are tested. The research results show that after adding a transparent cover to the smooth copper tube cavity,the heat collection efficiency of system increases from 22.10% to 25.82%. After adding a transparent cover to the black-painted copper tube cavity,the heat collection efficiency of system decreased from 30.40% to 29.50%. After covering the surface of the smooth copper tube with black paint,the system’s heat collection efficiency without a transparent cover in the cavity increases from 21.94% to 34.57%. The heat collection efficiency of the system with a transparent cover in the cavity increased from25.26% to 29.91%. The direct solar irradiance has a significant impact on the temperature fluctuation at the outlet of the cavity,but its impact on the heat collection efficiency of system is not significant.