Abstract: In order to find out the application effect of WOCO microbial agent,chitin and soil conditioner on pepper,Longjiao 8 and Jimei 205 were used as experimental materials.After applying WOCO microbial agent,chitin and soil conditioner,the growth,yield related indexes and soil physicochemical properties of pepper were determined.The results showed that the growth and development of Longjiao No.8 was promoted by applying WOCO microbial agent,chitin and soil conditioner,and the number of fruit,single fruit weight and yield were increased by 74.88%,63.97% and 69.85%,respectively.At the same time,it also promoted the growth of Jimei 205,but had little effect on its fruit number,single fruit weight and yield.Compared with the soil before cultivation,the pH of each treatment increased and the electrical conductivity decreased.The comprehensive comparison showed that,the application effect of WOCO microbial agent,chitin and soil conditioner on Longjiao 8 was significant.