This book discusses selected frontier and hot theoretical and practical issues of international law in the 21st century and in the process of China's peaceful development strategy, such as interactions between harmonious world, international law and China s peaceful development; close connections of China rule of law with international rule of law; issues of international law resulted from the war of Former Yugoslavia, establishment of ICC, DPRK nuclear test, Iraq War,  Independence of Crimea; features of WTO rule of law and its challenges as well as legal and practical disputes between China and other members in the WTO; recent tendency of regional trade agreements and  characteristics of Chinese practices in this aspect; legal issues in relations between China and the European Union with a view of the framework of China-EU Comprehensive Strategic Partnership.