The purpose of this research is to introduce a system development framework that can be utilized at school by evaluating the usability of the field experience learning system using mobile devices. A tool was designed for usability evaluation on the basis of usability evaluation items which are needed in education by considering the characteristics of the field experience learning system. In this study usability evaluation was performed twice. The 2nd usability evaluation was conducted after revising and complementing the system based on the results of the 1st usability evaluation. The results of the 2nd usability evaluation in four areas of evaluation are as follows: 95 points in instructional design, 85 points in technical characteristics, 82 points in user interface, and 70 points in learning contents, respectively. The evaluation points in the areas of instructional design, technical characteristics, and user interface have soared up while the point in the area of learning contents has increased slightly. As seen from the evaluation contents, it is evaluated that the items such as inquiry activity based on the map, location information of students and confirmation of progress of inquiry activity, and feedback of students activity are useful. In the area of learning contents, it is necessary to continuously monitor what types of inquiry activity problems could increase user satisfaction. In the future, it is necessary to complement the evaluation system by analysing learning activities in the post-stage of field experience learning and coming up with functions required in that stage.