Physocarpus opulifolius 'Lutein' and Physocarpus opulifolius 'Summer Wine' are two species of ornamental flowering shrub Rosaceae Physocarpus. They were introduced from abroad in recent years to enrich the landscaping virescence. It has been proved that the two color-leafed tree species are able to be wintering in the open field in parts of North China. But in Harbin region, they haven't been applied widely due to the limit of the low temperature. This paper studies on the cold resistance of the two color-l...