With the iterative upgrading of smartphones, mobile intelligent terminals have permeated all aspects of people’s study and daily life. Owing to their powerful functions, high efficiency and convenience, these terminals provide robust technical support for middle school geography practical activities. Taking the exploration of campus sundials as a case study, this paper constructs the teaching process of the activity featuring the framework of "goal-setting, design, implementation and evaluation", and carries out the inquiry procedure of "preparation, execution and summary". It explores the application paths of mobile intelligent terminals in such links as literature retrieval, positioning and measurement, as well as mapping and modeling, and evaluates their eff ectiveness from multiple dimensions, thereby providing a reference for advancing the innovative teaching of middle school geography practical activities.