The invention provides a monoclonal antibody for a proprotein convertase subtilisin Kexin 9 (PCSK9). The monoclonal antibody can block the binding of PCSK9 to a LDL receptor so that the level of LDL-Cis reduced. The monoclonal antibody provides a very effective agent for treating various CVD diseases.本發明提供針對前蛋白轉化酶枯草桿菌蛋白酶Kexin 9型(PCSK9)之單株抗體,其可阻斷PCSK9與LDL受體之結合,因此降低LDL-C之水準。本發明之抗體提供治療多種CVD疾病之非常有效的試劑。