Abstract: The following problems are studied in this paper: a) The seasonal variation of soil moisture and nutrients under Polownia-crop interplanting is affected by climate condition.The data analyses indicate that the content variations of soil moisture,Nitrogen,Calcium carbonate,Soluble calcium,and Magnesium occur mainly in May or August every year,the statistcal significale F being as high as 0.01. b) The content variations of the above mentioned materials are closely related with the distance from the tree plant and affected by biological elements.The variations are most significant within the scape of 2m—10m from the tree plant and within the depth of 80—100cm(F=0.05). These variations are intimately connected with both litter and rootsystem of Polownia forest.