This paper introduced professor JIA Yingjie’ s experience in treating malignant tumor with Dahuang（Radix et Rhizoma Rhei）

proposing that clinical application of Dahuang（Radix et Rhizoma Rhei） should not be limited to the scope of purgation herbs.In the treatment of malignant tumors

Dahuang（Radix et Rhizoma Rhei） can not only expel cancer toxin and blood stasis

but also regulate qi and bloold to achieve the effect of tonify deficiency

and harmonize five zang organs.At the same time

it is believed that expeling cancer toxin and blood stasis also had difference of gentle and drastic.The application of Dahuang（Radix et Rhizoma Rhei） should be comprehensively considered according to the severity of toxin and stasis

stool shape

and strength of vital qi.And the combination of Radix Rehmanniae Recens and Radix Rehmanniae Preparata is often used to avoid damaging the stomach.From doseeffect relationship and common compatibility

the dose of Radix et Rhizoma Rhei is summarized

proposing that small dose（3 ～ 5 g） of Dahuang（Radix et Rhizoma Rhei） is applied for relaxing the middle and tonifying the deficiency

middle dose（10 ～ 30 g） is applied for removing dampness and expelling turbidity

and the large dose（10 ～ 30 g） is applied for acute purgation and bowel-relaxing.And it is often used with Huangqi（Radix Astragali seu Hedysari） to reinforce vital qi and anti-cancer

with Zhiqiao（Fructus Aurantii）

Huopo（Cortex Magnoliae Officinalis）

Laifuzi（Semen Raphani） to smooth the qi movement of sanjiao

with Yujin（Radix Curcumae）

Jianghuang（Rhizoma Curcumae Longae） to resolve turbidity

remove toxin and dispel stasis.