Human embryonic stem(ES)cell research has been current hotspot of life science since 1990s.The stem cell is a kind of special and essential cell type found in human body,which can not only be amplified and self renewed,but can be derived into many kinds of cell lines.Scientists forecast that deeper research of ES cells will offer hope of new cures for leukemia,neurodegenerative diseases,and so on.While at the same time,stem cell research leads an important bioethical debate in the all world.