Aim: determining effect of honey milk protocol on constipation severity in acute coronary syndrome patients in coronary care unit. Study design: randomized clinical trial study. Research population: patients with acute coronary syndrome that hospitalized in CCU. Main inclusion criteria: complete consciousness; tend to participate in study. Main exclusion criteria: having not intestinal problems; diabetes; glucose and lactose intolerably; chronic constipation. Sample size: 30 patient in each group of test and control. Intervention: milk honey. Outcomes measures: defection status of patients from abdominal pain(by visual analog scale), form of feces by Bristol scale and severity of constipation by constipation assessment scale (CAS). Methods: after hospitalization to CCU, initially for each patients completed demographic and defection status questionnaire. Then patients divided to two group test and control randomly. In test group patients give 150ml low fat(1.5 percent) milk with one spoon table honey(approximately 30 gram) for three time a day for five days period. Control group patients receive routine care. Defection status of each patients in two group measured daily. Finally compared two group with each other from defection information.