Our knife method consists of two parts. The first part is the Undercurrent Catalogue written in Japanese and its "learning method". The second part is Qi's drilling method. "Mind with Knife" is a spectrum of Chinese and Japanese swordsmanship and a precious document in the history of Chinese and Japanese swordsmanship exchange.
For more than ten years, he actively promoted Japanese fencing in the army, and gradually explored a set of practical training courses, which was clearly recorded in his famous book Training the Army. During the decades-long military career, the troops trained by Qi Jiguang played an important role in Japanese invasion, Tatar invasion, Wanli Renchen Aid Korea and other wars. Obviously, learning from the enemy and applying it to the enemy is Qi Jiguang's outstanding point, which was beyond the reach of many conventional soldiers at that time. In particular, Qi Jiguang was the first to name this kind of "holding a knife with both hands" as "double-handed knife" or "double-handed long knife" or "Japanese long knife". Obviously, this is a well-thought-out name, a simple and appropriate name, so it has been used by serious martial artists since Qijia. In addition, the "undercurrent knife method" obtained by Qi Jiguang from the army with a heart was a masterpiece of various knife methods in Japan at that time, and its handed down "Subsurface knife method manual" is extremely valuable information for the researchers of both hands knife method in China and Japan today.
Then this kind of knife method influenced the long knife method and the single knife method in the choice of single knife method and the record of arms, and directly influenced the "Miao Dao" method and "two-handed Dao" method handed down from later generations. However, Taoist scholars in Gu Wu, Japan believe that Qi Jiguang's Catalogue of Yin (Yin) Flows is the fencing biography of Ape Flying in Yin Flows handed down by Aizhou Kojiro, the son of Aizhou, one of the "Three Sources of Japanese Kendo" in the Ming Dynasty.