The effects of different tillage methods with organic materials application on soil physical properties such as soil porosity water content，saturated hydraulic conductivity，aggregate stability and penetration resistance were studied in order to provide a theoretical basis to arable land construction and sustainable development for slope cropland in mollisol area.Six experiment treatments were set up: rotatry tillage with no material application(RT0)，rotatry tillage with straw application(RT1)，rotatry tillage with cattle manure application(RT2)，subsoiling with no material application(SS0)，subsoiling with straw application(SS1)，subsoiling with cattle manure application(SS2).The results showed (1)The that subsoiling with organic materials application significantly improved soil porosity，moisture content and hydraulic conductivity at 10 ～ 30 cm soil layers under the condition of maintaining the stability of arable soil physical properties.Compared with rotary tillage with organic materials application，subsoiling with organic materials application increased soil porosity by 2.76% to 4.01%，soil moisture content by 3.96% to 7.39%，and saturated hydraulic conductivity by 87.6% to 125.2%.These indexes were all higher than that of subsoiling tillage without organic material treatments.(2)Subsoiling with organic materials application reduced soil penetration resistance.The affected soil layer(35 ～ 45 cm) by subsoiling with organic materials application was deeper than that with no materials application(25 cm)，and the benefits of arable layer thickening continued for a whole maize growth period.(3)The aggregate weight dimension(MWD) of 10 ～ 30 cm soil layers increased by 21.3% to 23.1% under subsoiling tillage with straw application treatment，which was significantly higher than that of subsoiling tillage with cattle manure application and subsoiling tillage without organic materials application.The results indicated that subsoiling tillage with straw application could improve water holding capacity and hydraulic conductivity of soil below the surface，increase the depth of arable layer and enhance the stability of soil structure.Furthermore，the benefits of arable layer thickening and soil structure improvement continued for a whole maize growth season.Consequently，subsoiling tillage with straw application is an ideal technology for construction of slope land arable layer in the mollisol area of northeast China，which will provide technical support for construction of slope land arable layer in the mollisol area and soil improvement.