Chemical composition of plants, including 31 species of oxylophytes, 31 species of calciphytes, and 43 species of halophytes, growing on various parts of China, have been examined. Only leaves or pinnas of the plants were collected. Determinations were made to the ash, nitrogen, sulfur, phosphorus, aluminum, iron, potassium, sodium and calcium contents of the plants. In addition, the water soluble SO₄^2-, Cl^-, HCO₃^- of certain halophytes were also determined. It appears that the chemical composition of plants of the same ecological type is closely related to their taxonomic features. However, it shows significantly that the plants growing on the same soil type possessed more or less common chemical characteristics (Table 5).