A vibrant and efficient capital market, which ensures an orderly development and contains measures for protection of the investor's interest, is the most important parameter for evaluating health of any economy. The practice trading imposed limits on trading volumes and hence the speed with which new information was incorporated into stock market. Dematerialization is the processes by which a client can get physical certificates converted into electronic from and balances maintained in its account with the participants in the depository system. Hence the depository participants (DP) are very important in stock market. A very few studies are there on depository system in India. As such a book is taken up on Role and Performance of DPs in India.