Abstract: The recent location based services have been focusing interest in indoor location based services in which the signals used in outdoor services such as GPS cannot be used and the research on the indoor positioning system using BLE (Bluetooth Low Energy) iBeacon as foundation technique has been expanded. However, RSSI (Received Signal Strength Indicator) information of iBeacon used to acquire distance information required for positioning becomes low in reliability due to the signal distortion problem caused by environmental factors such as obstacles from its characteristic of radio waves and accompaniment of the signal delay problem caused by diffused reflection. This study suggests a technique to verify and optimize iBeacon signals for the reliable indoor positioning system.