Abstract: Nitrite and nitrate, moisture, crude protein, crude fat, crude fiber, vitamin C and other ingredients contained in the four kinds of common potherb in Yongzhou, which are Portulaca Oleracea, Lactuca India, Plantago asiatica and Pteridium aquilinum, were determinated and analyzed. The results showed that the content of protein, fat, fiber and vitamin C were high; especially content of vitamin C was much higher than that of the cabbage, a kind of traditional vegetable. Content of nitrite and nitrate in Lactuca India and Plantago asiatica were lower enough for eating with safety. But Portulaca Oleracea and Pteridium aquilinum, because of slightly higher nitrate content when compared with standard, and should be limited in consumption, in addition to take certain measures when cooking.