Abstract: This article briefly introduces the method to determine mercury content in source rocks with the model XG-3 determination apparatus, and shows that the linear relationship between organic carbon and mercury content in source rocks in Miyang -Honggang regions is similar to the variation of total hydrocarbons (indicator of organic geochemistry) with burial depth.- Judged from mercury-accumulation of stratigraphic temperature and organic matter, a preliminary explanation has been given to the above-mentioned variation curve. The author deems that after organic matter is converted into oil and gas,the mercury accumulation will be strengthened.