This book is based on the project "Development and validation of high resolution climate system models" with a support of National Key Basic Research Project under grant No. 2010CB951900. It demonstrates the major achievements in the development of new dynamical cores of Atmospheric General Circulation Model (AGCM) and Ocean General Circulation Model (OGCM) that are suitable for high resolution modeling, the improvement of model physics, and the design of a flexible multi-model ensemble coupling framework. It is a useful reference for graduate students, researchers and professionals working within the related areas of climate modeling and climate change.§§Prof. Rucong Yu works at the China Meteorological Administration; Prof. Tianjun Zhou works at LASG, the Institute of Atmospheric Physics, Chinese Academy of Sciences; Tongwen Wu works at Beijing Climate Center, China Meteorological Administration; Associate Prof. Wei Xue works at the Department of Computer Science and Technology, Tsinghua University; Prof. Guangqing Zhou works at the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences.§§