Abstract: Abstract: Field experiments were conducted in order to understand uptake and utilization characteristics of N, P and K of crops in chili pepper/maize intercropping system in chili pepper main production area of Qiubei County, Yunnan Province in 2006. The results showed that: (1) Contents of available N and available P in soil of intercropped marginal chili pepper line were lower than in soil of monoculture system. Contents of available N, P and K in soil of intercropped middle chili pepper lines were similar with in soil of monoculture system. (2) Contents of N and P in chili leaves of intercropped marginal chili pepper line were lower than in chili leaves of monoculture system. Contents of N and P in chili leaves of intercropped middle chili pepper lines were higher than in chili leaves of monoculture system. Contents of N and P in chili leaves increased from marginal chili pepper line to middle chili pepper lines. Contents of K in intercropped chili leaves were lower than in chili leaves of monoculture system during before harvest and higher than in chili leaves of monoculture system in harvest stage. (3) Contents of N in maize leaves in intercropping system were higher than in monoculture system. Contents of P and K in intercropping system were similar with in monoculture system before harvest and lower than in monoculture system in the harvest stage. (4) Yield and biomass of chili and maize in intercropping system were higher than in monoculture system. Keywords: Chili pepper; Maize; Intercropping system; Nitrogen; Phosphorus; Potassium;