Loy Krathong day is one of the most important traditions in Thailand because this day is considered to be a worship to a foot-print of the Lord Buddha. To avert a catastrophe on Loy Krathong day can be done by letting the sin drift along the river with krathongs. From the historical evidence, "Phra Ruang" (King in the Sukhothai period) in his speech said" : "-from now on , when the full moon of twelfth lunar month comes , the flying lantern will be made as the lotus shape. We will pay homage to the foot-print of the Lord Buddha for ever after-". Loy Krathong festival is organized in almost every part of Thailand. Each has the unique interesting celebration.