Since simple and convenient user interface, the Web is diffused widely. For integrating Web as a view of user interface and CORBA, CORBA object is made in applet, which is sent to Web browser in Client and executes by Web browser. To use CORBA Event Service in Web without violating a security constrains of applet, we need a interoperability of Event Service. This paper investigates interoperability of event channels of the event service of CORBA. We present three different methods that make one event channel. Pros and cons of each method are described. All mentioned approaches have been implemented in Java. An experimental performance evaluation has been carried out and evaluation results are also given.