As the main load-bearing member of solar greenhouse,wall is critical to the structural safe and stability of the greenhouse.The Steel-frame wall was put forward in the paper.The mechanical performance of the Steel-frame wall were studied and the structural performance of different specifications beams and columns with rectangular steel pipe were analyzed.The results showed that the new walls with the 80 mm × 120 mm × 3.0 mm rectangular steel pipe as beams and the 150 mm×150 mm×5.0 mm rectangular steel pipe as columns were able to guarantee the stability of the wall structure in the lowest price level.