This study examined the impact of Computer Based Instructional Package on Chemistry students' achievement in learning oxidationreduction reaction. Three research questions were raised and further hypothesised. The research design adopted for the study was the pretest posttest non-equivalent control group quasi experimental design. The population of the study was four hundred and eighty one (481) Chemistry students in senior secondary two in public schools in Oshimili South Local Government Area of Delta State. Simple random sampling (balloting) was used to select two secondary schools.