Abstract: Compared with traditional tillage,yield,dry mater and leaf area of double-subsoiling cover (DSC) in wheat-maize double-cropping system were studied in this paper。The results indicated that,yields of wheat and maize with DSC treatment were 5 561 kg·hm^-2 and 6 428 kg·hm^-2 respectively,which was increased by 15.9% and 7.8%,and showed a significant difference compared with the traditional tillage.Dry matter accumulation of wheat and maize with DSC treatment was increased by 2.95 g and 54.6 g comparing with traditional tillage at the maturing stage,Leaf areas index (LAI) changed as a curve of single-peak,while LAI of wheat is S curve and maize is parabolic curve.Comparing with the traditional tillage,LAI of wheat and maize of DSC was larger in all growth stages. And LAI decreased slowly on later stage,DSC treatment can slow down leaf senescence,lengthen leaf function period,and make more Assimilation product.