[Objectives] To conduct preliminary study on the chemical constituents in different plant parts of R. acetosa L. [Methods] The systematic pre-test method was used for physical and chemical identification of aqueous extract,ethanol extract and petroleum ether extract from different plant parts of R. acetosa L.,and the chemical constituents were preliminarily determined. [Results] The different plant parts of R.acetosa L. were positive in the identification test of carbohydrate,protein,phenol,organic acid,flavonoid and anthraquinone,indicating that these constituents may be contained; roots and leaves were negative in the identification test of saponins; the four plant parts of R. acetosa L.were negative in the identification test of steroid and triterpene in the ethanol extract,but positive in petroleum ether extract; roots and flowers were positive in identification test of volatile oil and fat. [Conclusions]By comparing the pre-test results about four different plant parts of R.acetosa L.,it was found that the total plant of R. acetosa L. might contain carbohydrate,glycoside,protein,phenol,organic acid,flavonoid and anthraquinone; the roots and flowers of R. acetosa L. might contain volatile oil and fat; stems and leaves might contain saponins. [Objectives] To conduct preliminary study on the chemical constituents in different plant parts of R. acetosa L. [Methods] The systematic pre-test method was used for physical and chemical identification of aqueous extract, ethanol extract and petroleum ether extract from different plant parts of R. acetosa L., and the chemical constituents were preliminarily determined. [Results] The different plant parts of R.acetosa L. were positive in the identification test of carbohydrate, protein, phenol, organic acid, flavonoid and anthraquinone, indicating that these constituents may be contained; roots and leaves were negative in the identification test of saponins; the four plant parts of R. acetosa L. were negative in the identification test of steroid and triterpene in the ethanol extract, but positive in petroleum ether extract ; roots and flowers were positive in identification test of volatile oil and fat. [Conclusions] By comparing the pre-test results about four different plant parts of R.acetos a L., it was found that the total plant of R. acetosa L. might contain carbohydrate, glycoside, protein, phenol, organic acid, flavonoid and anthraquinone; the roots and flowers of R. acetosa L. might contain volatile oil and fat ; stems and leaves might contain saponins.