This book is a collection of papers of the 5th Forum on the Theory and Practice of Socialism with Chinese Characteristics (2018), which collects the research results of more than 30 experts and scholars, focuses on summarizing the historical achievements and important experience of China's reform and opening up in the past 40 years, grassroots exploration and system improvement from the combination of theory and practice, conducts in-depth discussions on further deepening the study of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era and promoting the comprehensive deepening of reform and the development of socialist modernization. Targeted ideas, countermeasures and suggestions have strong theoretical value and important practical significance.