Inclusion Criteria:  age ranges from 19 to 85 yrs old stroke patients with unilateral hemiparesis 1st ever stroke chronic stroke (>6 months after stroke)  Exclusion Criteria:  recurrent stroke history of traumatic brain injury Minimental state examination score is 15 or less. Unstable medical conditions Severe delirium, disorders of consciousness pregnancy can not attach tDCS electrode on the scalp due to skin conditions can not maintain the sitting position intracranial metals