Abstract: GAO was a famous family in Dali Kingdom, they held the position of prime minister hereditarily in central government and the power could influence all over the eight prefectures and four counties. The Dali Kingdom governed the country with the Buddhism, all the people had a devout Buddhist faith. In order to know the Buddhism development about GAO's, after the study of archives, the stone inscriptions and other historical documents, it can be concluded that they developed the Buddhism such as built the Buddhist scriptures, the temples, the pagodas and the grottoes. At the same time, they promoted the Buddhist culture as a model in daily life, and the GAO's motivations of developed Buddhism were analyzed. At the last, it affirmed that GAO made a great contribution to the development of Buddhism for Dali Kingdom.