Bahaodoleh Razi Tarashti was born in taTarasht village of Rey (in northwest of present Tehran). He ended up the medical education in Rey and trend to practicing and learning medicine contemporary as spiritual guide of Noorbakhshi group. Although the birthday of Bahaodoleh is not clear exactly, bases on evidences, he probably has been killed in fractional struggle by agents of king Esmaeel Safavi at middle age about 915 after Hejrat. Bahaodoleh has written after ohammadebneZakariayeRazi the best book in clinical medicine profitting from his foundings and experiences. He is the first physician who has effectively described whooping cough. He has repeated Razi"s experiences in diagnosing Allergic diseases especially Allergic rhinitis, and has suitably explained them. His Kholasato-Tajarob that apparantly is the only work that has reached us from this unparalleled scientist, is arranged in 25 parts. It includes the privat experiences of Bahaodoleh as well as his observations and epidemic reports. Hehas discovered a vaccination of smollpox for the first time and he seems to be the first physician who has discussed sexually transmitted diseases such as sifilis ina scientific way. Specific attention to clinical medicine and acquire experience with the patient is the most important Bahaodoleh characters bases on. It refers at his book by the name of Kholasato-Tajarob. In detailed of this essay, there are the collection of clinical history about various diseases that has been menthionedin Kholasato-Tajarob.