“契约文书也称契约,是人们在具体的生产、生活、社会交往及关系中形成的用以证明某种关系的原始文字协议或文字认定。”“契约文书所载是日常生活中发生的经济关系、社会关系、人身关系的个案事实,同时也直接反映了历代政治经济、法律制度在基层社会的运作,可以补充正史、典章、史志和 ”Contractual instruments, also called contracts, are original textual agreements or literal assertions formed by people in their concrete production, life, social interaction, and relationship to prove a relationship." The contractual document contains the texts of daily life Economic relations, social relations and personal relations that occurred in the past years, as well as directly reflecting the operation of the political, economic and legal systems in the past generations at the grassroots level and supplementing the principles of official history, official seals, history records and