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Background:Porcine reproductive and respiratory syndrome (PRRS) is an economically important disease,which leads to severe economic losses in swine-producing areas of the world.PRRSV ORF7 encodes the nucleocapsid (N) protein,which constitutes about 20-40% of the total protein content of the virion and is essential during the assembly and disassembly of the virion.Currently,the application of RNA interference (RNAi) to the inhibition of PRRSV replication in cell culture becomes a research hotspot,which would become a promising method for the treatment of PRRSV.Based on previous researches and because of the high conservation of PRRSV N gene,we exploit to apply the RNAi technique by targeting N gene to inhibit the PRRSV replication.