Based on the single type of standardized documents in China and diversified requirements for standard application, documents types with explanations issued by seven standard development organizations (SDO) in foreign aerospace industry are investigated and researched by comparative analysis and classification research. According to the authority of document, the normalization of the formulation process and contents, foreign aerospace standardized documents in the aerospace field can be classified as standard, interim standard (immature standard), guideline/handbook, and informative document. Furthermore, combined with the current situation in China, suggestions on the diversity of standardized documents in China are put forward to provide users with multi-level, all-around, richer standardization information, which would be helpful to the interpretation and application of standards.