This is a randomized, paralleled study. Patients will be divided into two groups of treatment and control. all of them will receive conventional treatment based on specific condition, including digitalis, milrinone, furosemide, beta-blocker blues, Angiotensin-Converting Enzyme Inhibitors (ACEI), angiotension receptor blocker (ARB), and antiplatelet aggregation etc. Treatment group patients will receive hUC-MSC. Follow-up visit will occur on 3 months, 6 months, and 12 months after the cell transfusion. Vital signs, blood routine test, urine routine test, liver function examination, etc, will be placed to evaluate the safety of hUC-MSC treatment. And the change of symptoms to evaluate the efficacy.