Abstract: The plural personal pronoun often has different expressions in different dialects. Through the investigation and analysis of 356 northern dialects' personal pronoun system, we discover that there is a certain degree of asymmetry in the phenomenon of the grammaticalization of the plural form, the singularization of plural form, and the reinforced clitic of plural form between three personal pronouns in northern dialects. In other words, it generally follows the tendentious hierarchy of "first person > second person > third persop".