Based on the micro perspective,using the data of China Family Finance Survey (CHFS) in 2015,this paper discusses whether the land registration can release the De Soto effect of farmland assets and ease rural formal credit rationing. The IV-Probit model was used to test the heterogeneous effect of the land registration on the supply-and-demand dual credit rationing,and the interactive term of land registration and farmland management scale was introduced to further investigate the scale preference characteristics. Finally,the propensity score matching method was used to verify the robustness of the results. The results show that it is hard to get the the De Soto effect of farmland property fully released via the land registration under the constraint of China’s relevant legal systems and supporting measures. The mitigation effect of land registration on the supply-based credit rationing is limited to the scale farmers who have the advantage of borrowing,which shows the characteristic of scale preference. But the land registration has a full mitigating impact on demand-based credit rationing,and this is strengthened with the expansion of the scale of agricultural land management,which also shows the characteristic of scale preference.