Abstarct: Hospitals include different organizational units with a variety of different designs and different types of information processing professional health care staff. Due to the uniqueness of each patient care process, health care organizations with many challenges. In this regard the use of system management model the most appropriate method seems to work WFMS(work flow management system). Process management therapy using evidence-baxsed medicine (EBM) and by the guide will be realized. Health care information systems such as Hospital Information System must also support organizational processes and management of the patients. In this study, patient-centered processes in shahroud Imam Hossein hospital . And this process will be implemented on the nama system. And the pattern of time on this process applied.Next, using the event Calculate the time difference in terms of minutes and hours, and then the mathematical distribution of the resulting data .Finally, the definition of mathematical distributions defined on this process, we try to reduced time.