It is of great significance to develop solar energy resources in China

which changes the national energy structure

optimizes the energy allocation

and improves the comprehensive utilization rate of energy. A new kind of parabolic trough solar collecting heat system is put forward on the basis of analyzing the combined solar energy and traditional energy. During the daytime with enough light intensity

cold-water is pumped into the parabolic trough solar concentrator heated to the rated temperature. The water with rated temperature flows back to the hot-water tank

part of it flows through the heat exchanger to the heating system while the redundant hot water stored in the hot-water tank. During the nighttime or the daytime without enough light intensity

the hot-water tank is utilized to provide heat for the collecting heat system so as to achieve24-hour-heating.