This book is the best training material to cooperate with the training of joining the Party, and is carefully compiled by many party building experts of the Central Party School. Guided by Socialism with Chinese characteristics Theory, this book puts the study and application of the spirit of the 17th National Congress of the Communist Party of China in an extremely important position, which helps students to further understand party constitution, get familiar with the basic history of the Party, and thoroughly study the Party's theory, basic line, basic program and basic experience, so that students can more accurately grasp the Party's line, principles and policies and better apply them to practice. This book combines the latest theoretical achievements of the party and selects the latest party building materials. Before and after each chapter, there are practical columns such as introduction, key tips and thinking training. In addition, the test paper is presented with the book, which is a concise, practical, authoritative and standardized training textbook for activists joining the Party.