RMIP is supported by the Asia-Pacific Network for Global Change Research (APN) and dedicated to development of regional climate and environment models through inter-comparisons, and their applications for East Asia. The objectives of the project are: 1) to assess the status of East Asian regional climate simulations; 2) to provide more solid knowledge for further improvement of RCM applied for east Asia; and 3) to improve the confidence level for using RCM’s simulated results. It has been carried out in three phases since 2000, with 12 participant regional models from Australia, China, Japan, Korea, and USA. In current third phase, RMIP focuses on multi model ensemble in regional climate simulation and climate change projection.