This paper introduced professor DING Ying's clinical experience in the treatment of chronic immune thrombocytopenia （CITP） in children. It is considered that CITP is the disease of root deficiency and branch excess， taking “disharmony of qi and blood” as the root and “restlessness of channels and collaterals” as the branch， and the method of nourishing blood and tranquilizing collaterals is the basic treatment principle of this disease. The method of nourishing blood is the root of treatment， which includes replenishing

qi

and invigorating blood， fortifying and activa-ting spleen and stomach method； nourishing

yin

and supplementing the blood， enriching and nourishing the liver and kidney method； and invigorating and nourishing blood， dispelling stasis to promote regeneration method， given in corresponding to the pathogenesis of

qi

deficiency，

yin

deficiency， and blood stasis. The method of tranquilizing collate-rals is the branch of the treatment， which can be divided into clearing heat and calming blood， dispelling wind and softening liver， dispelling cold and warming collaterals， separately corresponding to the pathogen of latent toxin， latent wind， and cold-damp. In clinical practice，

Guipi Decoction

（归脾汤） and

Zuogui Pills

（左归丸） with modifications are commonly used， together with medicinals that can invigorate blood and dissolve stasis， clear heat， resolve toxins and cool blood， dispel wind and soften the liver， dissipate cold and warm collaterals. Simultaneously， it is emphasized that the concept of holism should be taken， and the principle of nourishing blood and tranquilizing collaterals should be followed. It is appropriate to keep the prescription and slow the plan， so that the condition can be stabilized.