Persistence behavior of chlorpyriphos in chilli was studied following application of formulation of 20 EC @ 160 (single dose) and 320 (double dose) g a.i.ha^-1 at fruiting stage. Samples of green chilli and soil under crop were drawn at different time intervals and quantified by gas liquid chromatography equipped with electron capture detector. The initial deposits of residue on the chilli fruit were 0.397 and 1.021 mg kg^-1 at single and double dose, respectively. Residues of chlorpyriphos dissipated to more than 75% after 10 days at both the dosages. The half-life period of chlorpyriphos in chilli was recorded to be 6.02 days at single dose and 5.67 days at double dose. Washing process was found effective in reducing the residues by 67.75 and 71.60 percent at, respective doses.