Abstract: The experiments were performed with two factors of randomized complete block design （RCBD） to study the effect of different planting method and plant spacing on agronomic traits and yield of pepper for outdoor in summer in Chifeng of Inner Mongolia. Two planting methods （single plant cultivation and double plant cultivation） had the same yield of pepper. Single planting cultivation of pepper had significant increase in plant spread, average fresh fruit weight, average fruit yield per plant and plant height. The results indicated that single planting cultivation of pepper for outdoors in summer with plant spacing 24 cm is the preferred planting method for pepper production in the Chifeng of Inner Mongolia.