Abstract: In order to study economic-water soil for space greening on ecological building, 16 kinds of artificial soil were made up by four factors, four levels design. The result showed: No 13,6,14,11,4 could notably prolong permanent withering-time and psychology withering-time of Pelargonium hortorum and Vinca major. At the same time, covering sand was beneficial for holding water. It’s positive to promote the growth of Vinca major.