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Though the subnet tearing strategy provides a fault diagnosis method of analog circuit with high performance, the lack of efficient test isolation and stimuli generation methods are still the chief difficulties and challenges in the practical application. Aimed to solve the afore-mentioned bottle-necks, a boundary scan based realization method is proposed. In the presented method, the boundary scan's "Virtual Probe" and "Independency Serial Test Path" technologies are adopted and afford an opportunity to put the subnet tearing fault diagnosis strategy into practical use.