Book excerpt: This book contains detailed documentation of the CHINAGEM model - a large-scale dynamic computable general equilibrium (CGE) model of China and its applications. Specifically, this book documents the theory and database behind the CHINAGEM model. This book explores the closure development for the four simulation modes of the model including historical, decomposition, forecast and policy simulations, the detailed explanation of how to analyze simulation results, and the extensions of CHINAGEM and their applications. These extensions include several innovative modules and case studies as examples of the application of CHINAGEM. This book provides an entry point for CGE modellers to develop their analytical skills. This book can also be used as a platform for research institutes to develop CGE models suitable for their research portfolio. The module developments included in this book are designed to capture the specific features of the Chinese economy. The applications of these modules chosen in the book cover hot policy issues in China, and the simulation results have valuable policy implications. This book identifies that the CHINAGEM model itself and all the extensions can be used for analysing many new topics and policy issues such as the effects of the USA–China trade war, the effects of Made in China 2025 Plan as well as China’s commitment to the carbon neutrality before 2060 and its economic implications.