The present study investigated the effect of constructivist learning approach on the achievement of students in chemistry. The study was conducted on a sample of 120 students studying in class IX of MDDAV senior secondary school, Ambala. For the study, pre-test post-test control group design was used. For the purpose of the study an intervention programme based on constructive learning approach (5E Model) and achievement test in chemistry developed by the investigators were used. t-test was used to compare pre-tests and post-tests of control and experimental groups. The results of the study revealed that before giving intervention programme both the groups were equivalent. There was a significant difference between achievement of students in chemistry of experimental and control group and significant difference was also found between the experimental group before and after intervention programme. This implies constructive learning approach was effective in enhancing the achievement of students in chemistry.