Human Umbilical Cord Mesenchymal Stem Cell Therapy (19#iSCLife®-CI) for Cerebral Infarction Patients in Convalescent Period.

40 participants will be selected based on eligibility criteria and collected information, then, randomly separated into two groups. All participants will sign informed consent form, monitor vital signs, laboratory examination (CT/MRI, blood routine examination, urine routine examination, liver function, renal function, etc.), NIHSS, Fugl-Meyer analysis (FMA) 0-3 days before treatment. All of them will receive basic treatment with Aspirin Enteric-coated Tablets and Atorvastatin Calcium. And experimental group will treat with hUC-MSC, control group with placebo (normal saline) on the 7th and 14th day. After the treatment, investigator will follow-up, monitor vital signs, laboratory examination, NIHSS, FMA analysis on 2 weeks, 1 month, and 6 months after the treatment.