Abstract: As cities grow faster, people have higher requirements for greening, not only to reduce costs but also to reduce floor space, and thus vertical greening soilless cultivation techniques came into being. In this experiment, four kinds of light culture substrates with different proportions were prepared to grow Pharbitis nil（L.）Choisy. By regularly measuring the plant height, chlorophyll content and nitrogen content of the leaves, comparing the physicochemical properties and fertilizer supply of the four culture substrates, the light culture substrate which is most suitable for the growth of Pharbitis nil was screened out. The test results showed that the bulk density of the four vertical greening substrates varied from 0.42 to 0.57 g/cm³; the saturated water retention, capillary porosity and total porosity of J4 matrix were the highest（The volume ratio of peat, earthworm dung, vermiculite, mushroom residue fertilizer is 0.5∶0.5∶2.0∶1.0）; The plant height, chlorophyll content and nitrogen content of the leaves in the J4 matrix were the highest.

Key words: vertical greening, Pharbitis nil, cultivation substrate, screening