A field experiment of Weike 702 and Xianyu 335 as experimental materials was conducted to researchthe effects of deep loosening and cultivation density on maize growth physiological characteristics and yield. The re-sult showed that by using deep loosening measure, root shoot ratio and loding resistance were increased under thecondition of high planting density, the distribution proportion of vegetative organs of maize dry weight was improvedeffectively, and reducing the degree of corn ear barren tip, the yied of maize was increased significantly. The yield ofWeike 702 reached the maximum at the density of 83 100 plant/hm², and yied maximum was 13 140 kg/hm², theyield of deep loosening was 9.7% higher than that of the control（11 975 kg/hm²）. The yield of Xianyu 335 reachedthe maximum at the density of 74 200 plant/hm², and yield maximum wse 12 663 kg/hm², the yield of deep looseningwas 11.16% higher than that of the control（11 392 kg/hm²）.