A humanized anti-human CD34 monoclonal antibody is provided, including a heavy chain variable region comprising an amino sequence as set forth in SEQ ID No. 1 and a light chain variable region comprising an amino sequence as set forth in SEQ ID No. 2.本案提供人源化之抗人類細胞表面抗原CD34之單株抗體,包括具有序列識別號1所示之胺基酸序列的重鏈變異區及具有序列識別號2所示之胺基酸序列的輕鏈變異區。