Abstract: The process of engineering geological investigation involves many work links and complex related data. Effective data organization is the basis of digital engineering geological investigation. We defined the investigation activities and all kinds of survey objects, analyzed the engineering geological attributes of these investigation objects, and established the UML model of these investigation objects. On this basis, we created a process-oriented engineering geological investigation concept model, and created a process-oriented engineering geological investigation data relationship model by designing main process attribute data tables based on the concept model. The model application shows that the model can meet the requirements of data organization of engineering geological investigation specifications.