The first hydrogen bomb was exploded successfully in the western China on June 17th, 1967. This test is another leap forward in the nuclear weapon development after China’s successful explosion of its first atomic bomb, which marks a new phase in China’s nuclear weapon development. This book is based on the oral account of over 10 interviewees who are the participants of the hydrogen bomb development. Meanwhile, in this book, a large number of precious historical pictures and archives are included.