The invention discloses a compound shown in formula (I), its tautomer or pharmaceutically acceptable salt thereof, and the application thereof in the preparation of drugs for treating HBV related diseases.本發明公開了式(Ⅰ)所示化合物、其互變異構體或其藥學上可接受的鹽,並公開了其在製備治療HBV相關疾病藥物中的應用。