This article is mainly to discuss the components, structures and other related issues as well in two kinds of arm forces, ¡§Tribe Arms¡¨ and ¡§Emperor¡¦s Arms¡¨ in the Shang Dynasty as the research scope. The components of ¡§Tribe Arms¡¨ are the frequently-seen ¡§Crowd¡¨ or ¡§Numerous People¡¨ in the Oracle Inscriptions, which is mainly composed of infantry served as by a crowd or numerous people and then is assisted by the professional military forces, ¡§Horses¡¨ and ¡§Bows.¡¨ With regard to ¡§Emperor¡¦s Arms,¡¨ its components include three fighting units-- ¡§Shi¡]®v¡^,¡¨ ¡§Horses¡¨ and ¡§Bows,¡¨ among which ¡§Shi¡¨ is infantry; ¡§Horses,¡¨ chariot soldiers; and ¡§Bows,¡¨ bow-and-arrow shooting soldiers. The component of ¡§Shi¡¨ is the frequently-seen ¡§People¡¨ in the Oracle Inscriptions, and the People directly belong to the Shang Emperor and are the professional fighting soldiers. The components of ¡§Horses¡¨ and ¡§Bows¡¨ are served as by the noblemen and the noble juniors. In addition, this article also discusses the other related issues, such as the original meaning of ¡§Shi,¡¨ the usage of ¡§Shi¡¨ and ¡§Ci¡]¦¸¡^¡¨ in the Oracle Inscriptions, and the meanings of ¡§Ya¡]¨È¡^,¡¨ ¡§Brigade¡¨ and ¡§Shu¡]¦§¡^¡¨.