Abstract: Borehole logs are a common enclosure to the documentation about detailed engineering geological site investigation at a particular location or landslide. They represent a graphical representation of the data obtained through field investigations, laboratory analysis and interpretations of engineering geological units. During the 2012, within the scientific research Croatian-Japanese SATREPS FY2008 project, in total of nine new boreholes in the Kostanjek landslide were drilled, for the purpose of installing equipment for landslides monitoring, as well as core interpretations of some of the performed boreholes. Borehole B-1, with a total depth of 100 meters, was drilled and cored for the purpose to obtaining informations about geological structure of the terrain and the depth of the sliding surface, and in it inclinometer tube length of 100 meters was installed. The core from borehole B-1 was sampled in detail along the entire length, on the samples were made mineralogical analysis and geomechanical testing, while paleontological analyzes are in progress. The eight boreholes (B-2, B-3, B-4, B-5, B-6, B-7, B-8 and B-9) were drilled for installation a variety of measurement equipment for landslide monitoring: seven accelerometers, three piezometers with the measurement of pore pressure and four vertical extensometers. In the borehole B-2 was also temporarily installed a device for hydrostatic pressure measuring. LogPlot is a specialized computer program to create a borehole logs in a way that creates a template of borehole log (i.e., Log Design) and the database of the borehole, which is designed as a set of tables for data entry. Results obtained in this thesis are the engineering geological and technical borehole logs compiled using the LogPlot software, which are comprehensive presentation of different data collected by drilling and supporting research, that is interpretations of drilling data. In addition, the table in which data is entered now serves as a database specifically for each borehole, which is later easily to change and update with the new data.