This book consists of seventeen chapters. They are: the basis of ultrasound, the use of ultrasound instruments, and ultrasound examination of lung, heart, abdomen, liver, pancreas, spleen, kidney, uterus and ovary. Ultrasound examination of superficial organs, limbs, head and neck blood vessels requires color Doppler instruments, which are not suitable for most communities at present, so this book does not introduce relevant contents. Books published in recent years, such as "Guidance on Ultrasonic Examination" and "Qualification Examination for Intermediate Professional and Technical Personnel", can be used for reference when reviewing. This textbook is also based on them, aiming at ensuring the continuity and consistency of knowledge learning as much as possible.