This book analyzes the dispute settlement mechanisms under the EU-China Comprehensive Agreement on Investment (CAI), including the already established mechanisms for general state-to-state dispute settlement and the Mechanism to Address Differences for investment and sustainable development issues. When China and the EU, two of the biggest players in international investment, announced the completion of the China-European Union CAI negotiations, the dispute settlement system remained incomplete. While they reached an agreement on state-to-state dispute settlement, the controversial investor-state dispute settlement is subject to ongoing negotiations. This book explores the possible procedural design of investor-state dispute settlement mechanisms under the EU-China CAI, including potential proposals, issues, and solutions. In addition, this work analyzes the separation, connection, and combination of state-to-state and investor-state dispute settlement, all with a mind to ensuring the function and operation of diverse mechanisms and establishing a comprehensive system for successful investment dispute settlement. Focusing on the complete dispute settlement system under the EU-China CAI, this book will be a valuable resource for students, academics, and policymakers working in the areas of international dispute resolution, international investment law, international economic law, and comparative law.