孙氏八卦剑，其道实出于八卦拳中，习者应以八卦拳为主，以八卦剑为辅。各派剑术都是以拳术为基础。拳谚云：精拳者未必皆通剑法，善剑法者未有不精拳术。

The theory of Sun-style Bagua Jian (sword) actually comes from Bagua Quan. The practicers should mainly practice Bagua Quan, with Bagua Jian as supplement. The blade techniques of every school are based on the boxing techniques. The boxing proverb: Boxing master no necessarily excels at blade techniques, while none of the blade masters doesn’t know boxing techniques.