Abstract: A variety of toxicants taking by self-slayer was inves■igated with statistical analysis according to the data from 1980 to 1985 by a certain district in Shanghai. As a result, the chemical toxicants have come into wide use for committing suicide as the percentage of them reached 76.72% of the total number of self-slayer.Organophosphate pesticide and sedasives were the most common chemicals used as shown by the percentage of 81.26%,and the percentage of them-DDVP,chlor-diazepoxide, diazepam, meprobamate and methaqualone was up to 76.51% of total toxicant intake suicides. However, the majority of death from chemical poisoning was organophosphate pesticide, especially DDVP, with 77.98% of total number among those of chemicals.