In the field of aerospace power systems, there are few books on fault diagnosis and fault tolerant control based on sliding mode theory. On the basis of authors many years of technical research and the results of many scientific research projects, this book comprehensively expounds the key theories and main methods of fault diagnosis and fault tolerant control of aerospace power systems based on sliding mode theory. Several design methods for sliding mode observers and sliding mode controllers are introduced, and are utilized to realize fault diagnosis and fault tolerant control for some typical aerospace power systems. This book has remarkable characteristics of combining theory with engineering.Except the Chapter 1 which is the introduction, there are three parts in this book. The first part is about fault diagnosis methods for aerospace power systems, which includes six chapters. The second part includes five chapters and different sliding mode control methods for aerospace power systems are given. The third part is comprised of the remaining seven chapters, in which several fault tolerant control methods for aerospacepower systems are discussed.This book can be used as reference book for scientific researchers, engineering technicians, teachers and senior undergraduates, masters and doctoral students, who are in the field of aerospace, automation, power machinery and engineering, specially enengaged in the research and application of system modeling,control,fault diagnosis, fault tolerance,etc.