Chronic cough is a common symptom in pediatrics. Based on the treatment law of time-segmented syndrome differentiation in

The Grand Compendium of Pediatrics

·

Treatment of Cough

（《幼幼集成·咳嗽证治》） and the theory of midnight-noon and ebb-flow doctrine， children's chronic cough is divided into five periods， which are the predawn， early morning， noon， afternoon and dusk. It is suggested to treat the lungs and spleen mainly while taking care of other organs. If the condition is aggravated at the predawn， it is mainly caused by food accumulation and lung deficiency，for which

Baohe Pill

（保和丸）plus

Yupingfeng Powder

（玉屏风散） is suggested to dissipate accumulation and boost

qi

. If aggravated in the early morning， the condition is mainly caused by phlegm fire rising， and

Qingning Powder

（清宁散）

with

Qingjin Huatan Decoction

（清金化痰汤） can be used to direct

qi

downward and dissolve phlegm. For condition aggravated at noon， stomach fire and exuberant heat is the main pathogenesis， and

Jupi Decoction

（橘皮汤） with

Qingwei Powder

（清胃散） is suggested to clear fire and direct counterflow downward. If there is aggravation in the afternoon， the main pathogenesis is

yin

-water depletion， and

Qingzao Jiufei Decoction

（清燥救肺汤） can be used to nourish

yin

and promote fluid production. In terms of aggravation at the dusk， fire floating in the lung is the main cause， which can be treated with the method of reinforcing

yin

and dissipating heat with

Maiwei Dihuang Pill

（麦味地黄丸）with

Huanglian Ejiao Decoction

（黄连阿胶汤）. All the above provide a new idea for clinical treatment of chronic cough in children.