Abstract: To explore the best depth and period of subsoiling suitable for high yield well irrigation area in Shandong province，in the representative Zhangqiu district of Jinan city，1S-250 type omni-directional inverted trapezoid（shovel）deep subsoiling machinery was selected to carry out the comparison of no till sowing operations with depth of 25，30 and 35 cm，respectively.Data of soil bulk density，soil nutrient，yield of wheat and maize，cost of subsoiling operation and new economic benefit per unit area were analyzed.Results showed that in the high yield well irrigation area with moderate water content and loamy soil，the best depth of subsoiling was 30 cm.Deep subsoiling once every 2-3 years could not meet the needs.Thus，it was suggested to adopt periodic combination cultivation mode.