Information system (HIS) meant to implement an integrated system for the production of information necessary for the management of all activities related to health, such as planning, monitoring etc. coordination and decision-making. Support of the activities of the hospital in the levels of functional, tactical . task of HIS is that of the computer and communication means to collect, store,.The purpose of HIS establishment of a system of processing. recovery, which took place in the care of the patient and Information Office for all activities related to the hospital can use. In an Information System, a hospital, etc. data for coherent in the database are stored and available to authorized users, in place and at a time when the data is needed and in the format that the needs of the specific user matches. placed. Generally cases, the goals of such a system are :
1.Use Resources Limited for the care of the patient are available
2.Improve the quality of service to the patient
3.Support of research
4.Support training

the spread of this system in the 90's, in different communities, including Iran, the importance and position make it more clear .The implementation of this system in hospitals in different regions of the country represent the cultural infrastructure, etc., appropriate technology for developing and completing health systems in accordance world. In recent years, with the rapid advancement of Technology HIS for a newer to the that not only of the categories of management, but also from the category of clinical interest very impressed .There equipment is equipped with computer facilities and clinical and also the male CE computer designed, like the special departments of clinical and clinical and used advanced societies, medical, of such software and its use in international communications and the necessity to preserve privacy and privatization, the gamut of HIS has caused that this set of complex information and technologies to the architecture of information integrated.