Islamic Banking is anything that involves sharia banks and sharia business units, including institutions, including business activities, and procedures and processes in carrying out its business activities. One reason people choose a Bank is whether the Bank can provide benefits and convenience to them, Each customer will pay attention and consider various factors to decide saving. In addition, customers also pay attention to the quality of services and products offered so that customers are motivated to use it. Of these various factors. Nationally, the growth of sharia banking has increased, but especially for Riau Islands Province the growth of sharia banking has decreased, based on the problem by using analysis tool of cochran Q test, the researcher try to study whether there are factors influencing customer decision in saving in syaria bank in Batam, and Is there a dominant factor affecting the decision of customers in saving in syariah bank in Batam City, the result of this research found that there are factors influencing customer decision in saving in syaria bank in Batam City, Also from external variable variable the most dominant in influencing customer decisions in saving in Islamic banks in the city of Batam is on cultural factors on cultural indicators of the State and Promotion factors on the indicators of convenience and internal variables are the most dominant in influencing customer decisions in saving in the tire k sharia in Batam City that is factor of service on indicator Courtesy of officer and facility factor at indicator of ATM.