The main purpose of this study is to understand the visitors perception of science after visiting the science thematic exhibition at the National Science Centre , KL. This study intended to see if there are any significant differences between the pre and post visit.The data were collected through questionnaires distributed personally to the visitors of the exhibition. 198 respondents were involved in this study. The findings showed that there are significant differencs between the pre and post visit perception of visitors to the science thematic exhibition.