The purpose of this study is to identify the problems of the reciprocal borrowing service in Korea and to develop the reciprocal borrowing model. Using interview and survey method were used for collecting data. Results show that public librarian had positive thought about reciprocal borrowing service and there were many problems to solve before operating the service. Main problems were: leaking of private information, responsibility of lost materials, budget and staff, borrowing regulation, non-competitive libraries. Also three reciprocal borrowing system models were introduced: integrated system model, distributed system model, and reciprocal arrangement model.