Abstract: Greenhouse is an irreplaceable technology in modern agriculture， but it was easily affected by weather. The combination of solar energy\|ground source heat pump system can make full use of the complementary advantages of both of them. It confirmed the stable operation of greenhouses all year round. Therefore， a solar greenhouse combined with ground source heat pump system and the PLC control circuit of the system were designed， and the brief analysis on the feasibility was carried out. It also provides certain reference and suggestion about subsequent application of the greenhouses combined with solar energy and ground source heat pump system.

Key words: solar energy, greenhouses, ground source heat pump, combined system, PLC control