In Jin Yong's novels, the Nine Yin Manual and Nine Yang Divine Technique were extremely powerful martial arts manuals created by two top experts, Huang Shang and Zhou Botong. Although the names of these two martial arts were different, their principles and characteristics were somewhat similar. The Nine Yin Manual and Nine Yang Divine Technique both focused on the cultivation of internal energy. Both the Nine Yin Manual and Nine Yang Divine Technique required the practitioner to improve their internal strength and martial arts skills through hard practice. These two martial arts emphasized the use of inner energy to defeat the enemy. In addition, the Nine Yin Manual and the Nine Yang Divine Technique were also used differently in battle. Both the Nine Yin Manual and Nine Yang Divine Technique could shoot out powerful inner strength to attack the enemy's weakness. However, their attack power depended on the strength of the practitioner's internal strength, so the practitioner needed to continuously cultivate to improve his attack power. To sum up, although the Nine Yin Scripture and Nine Yang Divine Skill have different names, their principles and characteristics have some similarities. They both pay attention to the practice of internal strength and the use of softness to overcome hardness. In Jin Yong's novel, these two martial arts secret manuals were extremely powerful martial arts secret manuals, which had important guiding significance for those who practiced martial arts.