中文摘要：

民初在制定法付阙的情况下有时直接适用习惯，大理院有时运用第三顺位法源的条理扩张性地解释制定法和习惯，试图调和制定法、习惯和条理三者之间的关系。通过这种法律适用，民初田宅买卖契约法逐渐摒弃了形式主义的传统，开始注重契约的本质——合意，彰显出契约自由的时代追求。

英文摘要：

In the circumstance of being lack of statute laws, the Central Judicial Office of the early Republic of China sometimes directly applied the common practice and sometimes regulations as the third sequent law source could ex- pansively explain statute laws and common practice, which aimed to coordinate the relationship among the statute law, common practice and regulations. With the help of the law explanation, the formalism tradition in the farmhouse sale contract was gradually banished at the early Republic of China, the transformation from the form to consensus was realized and the appeal to the freedom of contract was embodied.