OBJECTIVE： To establish a method for the contents of gallic acid， catechin， sennosides B， aloe-emodin， rhein， emodin， chrysophanol， physcion， chrysophanol -1-O- glucoside  and emodin -8-O- glucoside in Rhei Radix et Rhizoma， Jiu Rhei Radix et Rhizoma， Shu Rhei Radix et Rhizoma， Rhei Radix et Rhizoma tan， Cu Rhei Radix et Rhizoma， and analyze the differences. METHODS： HPLC was performed on the column was Hypersil C18 with mobile phase of methanol - 0.2％ acetic acid（gradient elution） at a flow rate of 1.0 ml/min， the detection wavelength was 260 nm， column temperature was 25 ℃， injection volume was 10 μl. RESULTS： The linear range was 0.252 5-4.040 0 μg for gallic acid （r＝0.999 6）， 0.600 0-9.600 0 μg for catechin （r＝0.999 6），0.297 4-4.758 4 μg for sennosides B（r＝0.999 9），0.001 8-0.028 8 μg for aloe-emodin（r＝0.999 9），0.005 0-0.080 0 μg for rhein （r＝0.999 9），0.019 0-0.304 0 μg for emodin （r＝0.999 8），0.380 2-6.083 2 μg for chrysophanol（r＝0.999 7），0.008 2-0.131 2 μg for physcion （r＝0.999 8）， 0.126 0-2.016 0 μg for chrysophanol-1-O-glucoside（r＝0.999 6） and 0.111 3-1.780 8 μg for emodin -8-O-glucoside （r＝0.999 8）； RSDs of precision， stability and reproducibility tests were lower than 3.0％； recoveries were 96.17％-97.21％ （RSD＝1.67％，n＝6）， 97.60％-100.54％ （RSD＝2.55％，n＝6），99.45％-101.32％ （RSD＝1.63％，n＝6）， 95.31％-98.19％ （RSD＝2.42％，n＝6）， 98.99％-100.35％ （RSD＝1.86％，n＝6），98.95％-101.21％ （RSD＝2.17％，n＝6）， 99.81％-100.62％ （RSD＝1.66％，n＝6）， 96.78％-98.52％ （RSD＝1.99％，n＝6）， 97.80％-100.14％ （RSD＝3.32％，n＝6） and 97.40％-101.24％ （RSD＝2.89％，n＝6）. Compared with Sheng Rhei Radix et Rhizoma， the contents of gallic acid， catechin， sennosides B and anthraquinones in Cu Rhei Radix et Rhizoma， Jiu Rhei Radix et Rhizoma and Rhei Radix et Rhizoma tan decreased. The contents of catechin， sennosides B and anthraquinones in Shu Rhei Radix et Rhizoma. Catechin， sennosides B， chrysophanol -1-O- glucoside， aloe-emodin and rhein were not detected in Dahuang tan. CONCLUSIONS： The method is simple with good precision， stability and reroducibility， and can be used for the simultaneous determination of 10 chemical components in processed products of Rhei Radix et Rhizoma； there were significant differences in contents of  10 chemical components in processed products of Rhei Radix et Rhizoma.