This research focuses on a concept of location-based service (LBS) and further extend to design a set of smart phone application (APP) with mobile augmented reality about Yilan hot spring. The APP is divided into two parts: map module and augmented reality (AR) module. The map module enables people to search the hot springs' information and their corresponding positions by combining the application with the use of Google Map. The AR module uses the point of interest (POI) with two-dimensional virtual image in the real scene that allows people find the location. In addition, we provide the Quick Response code (QR code) for each of the POI, which assists the users to link to the original website of Yilan hot spring by scanning the QR code. The APP also provides the function of camera that allows its users to capture the photos and record the videos in this APP. By using this Mobile AR APP, people can search the information about Yilan hot spring anywhere and anytime.