Conclusion Rheum of ficinale and the dynamic changes of the decocting time.According to the experimental results, 50min is considered to the decocting time when Rheum of ficinale is used cathartic.

• 由此可见，大黄的动态变化与煎煮时间有关，通过本试验结果，可以作为大黄用于泻下作用煎煮的最佳时间。