Abstract: In Qiubei County,Yunnan Province,we have carried field experiment to study the effects of different intercropping patterns on incidence of diseases and pests in chilli pepper from 2007 to 2008.The results showed that intercropping chilli pepper with maize,soybean,peanut and sunflower reduced incidence of diseases in chilli pepper by 14.6%,5.2%,10.1%,12.3% comparing with monoculture (CK) respectively,and reduced incidence of pests by 6.8%,1.4%,4.4%,3.3% respectively as well.For major diseases incidence among soybean,maize,sunflower and peanut intercropping,soybean's diseases incidence was the highest (61.1%) ,corn's diseases incidence was the lowest (15.0%),sunflower's (45.5%) and peanut's (20.8%) were between them.The patterns of intercropping two rows of maize with eight rows of chilli pepper (M2C8) and intercropping two rows of maize with ten rows of chilli pepper (M2C10) were good for diseases and pests control.M2C8 can reduce diseases incidence of chilli pepper by 15.6% and reduce pest incidence of chilli pepper by 6% comparing with CK,M2C10 can reduce incidence of diseases by 13.4% and reduce incidence of pest by 12.8% comparing with CK.The diseases and pests incidence of maize in M2C8 (13.4%) and M2C10(12.8%) were better than other intercropping patterns'.The results showed that M2C8 and M2C10 intercropping patterns could be applied and demonstrated into large scale planting for diseases and pests control of chilli pepper.