This research aims to assess the feasibility of project book Geotechnical Engineering assisted Plaxis 2D application which has a function as an increase in hard skills for the students in applying the concept of learning Geotechnical Engineering with Computer Application. The method of this research uses Research and Development with the development model is Borg and Gall. The subjects of this research are Civil Engineering students who take the subject of Geotechnical Engineering with Computer Application and the object of this research is a project book that will be validated by 2 validators (media and materials) and 1 practicality lecturer. From the three testing feasibility that have been done, and that have been obtained the results show that the teaching materials are feasible to be developed and practical to be used as an effort to bring up hard skills in the field of geotechnical.