1. In the process of purifying the Sangha (Buddhist Monastic order), the Buddhist Justice Court plays an important role. Its objective is to purify Individual oriented violation of the Buddha’s teaching ; and organizational oriented violation of the Buddha’s teachings. 2. The process of purifying the teachings is done by collectively reviewed and decision making by a group of qualified elders. From the time of the Buddha, to the time after Buddha’s entering parinibanna (passing away), until today’s practice in Myanmar, the monastic order follows these two processes, as well as obtaining support from the government, to remove the “illegal” activities and its support force. By doing so, it maintains purity of Buddha’s teaching effectively. If it only goes through the purifying process but not removing its supporting force, the wrong teachings or views will come alive again. This thesis examines the causes, processes, and results of the following three phases of how the Sangha justice court works in details: 1. the period when the Buddha is alive. 2. the period that the court was operated by the disciples of the Buddha. 3. the period that Sangha in Myamar operates its justice court today.