For the purpose of saving fuel, improving safety, and comfort, Advanced ECS is developing now. MDC, OBNOGS, Desiccant units, and CO2 Removers are involved in the Advanced ECS and are developing. System analysis of the Advanced ECS is performed to build up Non-Bleed aircraft. In this paper, we show the development of the components (i.e. MDC, OBNOGS, and Desiccant unit) and the results of system analysis as a non-bleed aircraft and system evaluation based on the regulations.