With different ratios of Platanus leaves and Populus canadensis Moench leaves as test materials,the effect of the deciduous trees bio medium of urban garden green land soil on bulk density,organic matter content,pH value and N,P,K content were studied.The results showed that the effect of using the leaves of Platanus and Populus canadensis Moench made bio medium to improve greenbelt soil was remarkable,treatment 1,2,3 could effectively reduce the soil bulk density,improve good soil structure；effectively improve soil organic composition,reduce the alkaline soil pH value,improve the effectiveness of fertility,improve plant root growth environment；significantly improve the soil N,P,K content and effectiveness.