The most obvious function of stem cell lies on its capability of reproducing brand new, normal, even younger cells, tissues and organs so it is applied at treating renal failure, diabetes mellitus, liver cirrhosis, stroke, leukemia, paraplegia, cerebral palsy, Parkinson’s disease, etc. Patients with those intractable diseases are difficult to gain therapeutic effect from traditional treatment. Also, stem cell therapy brings a good effect to anti-aging. Stem cell therapy with immeasurable medical value brings new hope to patients.