Objective: To figure out the effects of intercropping corn on the growth and quality of Pinellia ternata. Under normal Pinellia sowing density, two intercropping methods of corn wide-narrow rows and equal rows and three corn planting distances of 35, 50, and 65cm were adopted to measure the changes of Pinellia ternata growing environment, growth, yield and quality of P. ternata, then the land equivalent ratio and interspecies competitiveness under the intercropping system were further analyzed.The results showed that with the increase of corn planting density, the canopy light intensity of , the leaf surface temperature and the soil temperature of Pinellia ternata were all decreased, whereas the main leaf area, petiole length and SPAD value of P. ternata were significantly (p≤0.05) increased in the inter cropping system. The land equivalent ratio in the intercropping system increased, and corn was more competitive than P. ternata; Intercropping corn significantly increased Pinellia ternata yield and thousand-grain weight.under the condition of corn with a 35 cm equal rows plant spacing had the highest Pinellia ternata yield , an increase of 44% compared to Pinellia ternata monoculture;The quality of Pinellia ternata has no significant difference compared with the control ,and all meet the requirements of Chinese Pharmacopoeia. Intercropping corn provides a better growth environment for Pinellia ternata, makes Pinellia ternata oleifera better growth, and improves Pinellia ternata yield.