The research is based on the multi-subject evidence to proving the origin of white couch Garuda symbol in Naxi Dongba Pictograph. According to the relationship between phonetics and semantics of Garuda in Tibetan and Naxi, we found that the archetype of white couch Garuda symbol in Naxi Dongba Pictograph origin from the Garuda of ancient Indian Hinduism and Buddhism and khyung in Tibetan culture, with the spread of religion and culture in Himalaya area, Garuda symbol accepted by Naxi and pronunciation of Garuda in Naxi also borrow from Tibetan. A Probing studies of white couch Garuda symbol in Naxi Dongba Pictograph show us a splendid cultural exchange history of Indian, Tibetan and Naxi, we when probation into the origin of Character in writing system, essential evidence of our point should from inner or outer of writing system , we cant just relay on inner of writing system.