This study has been carried out to compare the exogenous cough(外感咳嗽) to western medicine. The results were as follows: 1. The exogenous cough(外感咳嗽) on the oriental medicine was similar to U.R.I., Infectious pneumonia, acute bronchitis on the western medicine and acute bronchitis was most similar to the exogenous cough(外感咳嗽). 2. The exogenous cough(外感咳嗽) was caused by the six devils of the environment(六淫) involving the lung and clinically divided into poonghan cough(風寒咳嗽), poongyul cough(風熱咳嗽) and poongjo cough(風燥咳嗽). 3. The symptom of the exogenous cough(外感咳嗽). a. poonghan cough(風寒咳嗽): sputum-rare and white color, laryngeal voice and tickel, stuffed-up and running nose, chilling and fever, headache and generalache, seoltae(舌苔) - thin and white color, pulse - boogin(浮緊). b. poongyul cough(風熱咳嗽): sputum-thick and yellow color, difficult expectoration sore thraot and thirsty, fever and chilling, sweating or headache, seoltae(舌苔) - thin and white color, pulse - boosak(浮數). c. poongjo cough (風燥咳嗽): dry cough with no or a little sputum and difficult expectoration, chest pain, dryness on the pharynx and lips, chilling and fever, seoltae(舌苔) - thin and dry, yellow color, pulse - sesak(細數) 4. The treatment of the exogenous cough(外感咳嗽). a. poonghan cough(風寒咳嗽) : sopoongsanhan sunpyuegihae (疎風散寒 宣肺止咳) b. poongyul cough(風熱咳嗽) : sopoongcheongyul sunpyuegihae (疎風淸熱 宣肺止咳) c. poongjo cough(風操咳嗽) : chungpyueyunjo saenggingihae (淸肺潤燥 生津止咳)