The objectives of the thesis were: 1) to find out the history of praying for rain in Buddhism, 2) to explore the ritual of praying for rain in Lanna through the procession of the Kaen Chan Buddha Image, Wat Pa Tan Luang, Mae Ta District, Lampang Province, and 3) to analyze the ritual about praying for rain in Buddhism through the procession of the Kaen Chan Buddha Image. This study was a qualitative research methodology by studying information from Tripitaka, commentary, documents and in-depth interviews with 10 Buddhist monks and villagers who attended the ritual, and then analyzed the content in a descriptive form.      

          The findings indicated that Buddhism, it is mentioned that the factors caused the rain it is caused by natural factors. Buddhism also believed that rain or not because it was caused by human actions. If human beings were good, moral and upright, it would bring nature to normal and seasonal rain, but if human beings were not in the Dhamma causing turbulent nature which caused no rain seasonally and when there was an unusual rain that was not a rainy season which was believed that it arose from the inspiration of the powerful deities, including Sakka Devarãja, the joyfulness of Thep vassawalahaka, Thep pajjuna, and followers who had the power.

          Praying for rain in Thai society there were all sectors and very such as Poo Than had the influence beliefs in Isan, North, and Central region. The rituals of Hae Nang Maew, Bang Fai (Rocket Festival), were including Pla Chon etc. these praying for rain ritual will be held only in the year when it was drought if there was a seasonal rain, the ceremony will not be held at all.

          There were many forms of ritual for rain praying in Lan na, including the procession of Phra Chao Fon Saneh Ha, Chi Bang Fai (Light Fireball), Worship to Phrayathan, the procession of White Elephant, the procession of Pla chon etc. Especially, Wat Pa Tan Luang, Mae Ta District, Lampang Province by having the Kaen Chan Buddha Image that was believed and created in Buddhist era. The villagers believed that can inspire the rain by inviting Kaen chan Buddha Image twice a year, that is New Year or Songkran Day and Yi Peng Festival. If there was a drought in any year, farmers are unable to do agriculture they will invite Kaen chan Buddha Image in special circumstances by inviting to enshrine another village which the community cooperated helped to organize the ritual by donation, inner strength, offerings, wearing white cloths and observing the precepts at the temple and listening to Dhamma this practice was done in principles of Puññakiriyã-vatthu, including Dãna, Sîla, and Bhãvanã these made the unity of community, had inherited the valuable tradition and income to stimulate the economy.