Since the birth of Sun Tzu's Art of War in the late 6th century B.C., it became widely influential in China. For thousands of years, the great volumes of ideas, categorizations, theses and judgments coming out of Sun Tzu's Art of War have been the object of debate in traditional Chinese military science. It could be said that Sun Tzu's Art of War charted the development course for ancient China's theory of war, establishing the foundational spirit of China's traditional military philosophy. From the 19th century to the first half of the 20th century, this ancient Chinese work of military strategy gradually attracted the attention and interest of Western society. Since the latter half of the 20th century, Sun Tzu's Art of War has continued to spread throughout the world. As we have entered the 21st century, the influence of Sun Tzu's Art of War has not declined; rather, it has taken another step towards surpassing the constraints of regional and language barriers, gain- ing the respect of more and more people of every color. What kind of a person was Sun Tzu? And what kind of a book is Sun Tzu's Art of War? What important military theories did he put forward? What were his views on issues of war? Let's take a look together at the world of Sun Tzu.