This paper provides a review about major work done on design of Baffle plates and its different orientations to improve overall performance of shell and tube heat exchanger. Major factors which affect performance of shell and tube heat exchanger are shown in this paper and also comparisons between different baffle orientations are shown. Now a day’s most of research done on different orientation angles of baffle which gives improved performance over straight segmented baffle. In most cases, 40° baffle inclination angle as well as low baffle spacing will give the best results. Moreover, sealing strips are more likely to improve the performance of shell and tube heat exchangers with segmented baffle.