According to the practical requirement for photo, coordinates and azimuth angle in forest pest investigation, a forest pest investigating system is designed and implemented. Within the system, remote sensing images and forest maps are used as base maps, the embedded GPS is used for navigation and location data collection, the embedded camera is used to take photos in field, the electronic compass is used to capture azimuth angles, and an interface is used to input descriptive attribute data. The result of investigation which be directly saved as Spatial data format. This system can greatly improve the work efficiency and provide an advanced methodology for forest pest investigation.