Objective: To establish the quality standard of Radix Rosae Laevigatae.Method: Sample was determined according to the procedures recorded in Appendix IXH

IXK and XA of Chinese Pharmacopoeia

published in 2005

on moisture

ashes and extracts determination respectively.The content of total flavonoid was measured by UV method.Result: The safe moisture in Radix Rosae Laevigatae was less than 13.53%

with the total ash content within 5.03%

acid insoluble ash content was that lower than 1.21%

the content of water extract with cold soak was higher than 11.03%

and the hot soak was higher than 22.18%;the content of alcohol extract with cold soak was higher than 18.08%

and the hot soak was higher than 26.65%;that of ether extract was higher than 0.32%;the total flavonoid content in the dry weight of Radix Rosae Laevigatae should not be lower than 7.41%.The average recovery was 103.27%（RSD 2.03%）.Conclusion: The method is easy to operate and the result is reliable

it can be used for the quality control of Radix Rosae Laevigatae.