To study Shenmei Jianwei capsule preparation technology. Methods:The volatile oils were extracted by steam distillation. The volatile oil yield was taken as examining index to investigate the influence of soak time, additive quantity of water and distillation time on extraction process. In order to extract rate and the content of naringin as examining index, main factors of water decoction extraction process, water content, decoction time and extraction time were examined By L9 (34) orthogonal test. Results:Add 5 times of water than herbs, then soak the herbs for 4 hours and distillate them 7 hours to extract the volatile oil. Water extraction 2 times, add water 6 times and 4 times higher than the amount of herbs respectively. Extraction lasts 2 hours. Conclusion:The results can be used in preparing Shenmei Jianwei capsule, and can be applied to production.