The development of an increasingly advanced era like now has made the needs of the community increase as well. Moreover, it is driven by the very Fast technological advances. The influence of technological developments has touched various fields, for example, in the field of Professional Event Organizer (EO) Service Providers . Technology has been included in it as a tool for doing a job or identifying such as the feasibility of an EO to run an event. Therefore, in determining EO, it is necessary to design a decision support system using the Multi Objective Optimization method On The Basis Of Ratio Analysis or what is called MOORA. This system is expected to help solve problems and it is hoped that this system will help service users who want to use EO services, so they do not get disappointed when the event takes place.