A new method for model splicing for power system relay protection integrated setting calculation is proposed, which adopts the boundary breaker as the splicing locality. The overall approaches are discussed according to both the demands of different users and the diverse modeling method in factual engineering application. The technology has simple principle, strong currency, and high reliability, and is easy to program, besides, has lower request on the standardization of data model for different users. The analysis results show its efficiency and merits in Anhui electric power system, and therefore it has high engineering value in model splicing for power relay protection integrated setting calculation.