A foundation is used to support a building or structure and transmits loads directly to the\u00a0underlying soil or rock. It must provide an adequate factor of safety against failure of the supporting\u00a0strata, as well as failure of any excessive settlement which can interfere the function of the structure.\u00a0Ultimate bearing capacity of a specific foundation is one parameter commonly used to describe the\u00a0performance criteria of both the soil and the structure above. It can be improved by the inclusion of\u00a0reinforcements in the ground such as geotextiles. In practice, geotextiles are normally placed\u00a0directly on the soil in the form of sheet and then covered with aggregates. This research was\u00a0conducted specifically to investigate the effect of different sand relative densities inside the\u00a0geotextile pillow, an alternative of geotextile installations in practices, on the bearing capacity of\u00a0pad foundation by laboratory experiments. A-10 cm x 10 cm pad foundation model was developed\u00a0in a 1 m3 box filled with sand to actualize this experiment. Geotextile sheet was formed into a\u00a0pillow, filled with sand with different relative densities and placed at a predetermined depth from\u00a0the sand surface. As a result, the bearing capacity of the pad foundation model was proved to\u00a0increase by 50% using a sheet of geotextile compared to the one without any geotextile. Moreover,\u00a0to the same condition, the use of a geotextile pillow with different sand relative densities inside the\u00a0pillow, i.e. 30%, 50% and 70% remarkably improved the bearing capacity of the pad foundation\u00a0model -from 150% to 525%. Among the experiment results using a geotextile pillow, the 66.67%\u00a0addition of sand relative density increased the bearing capacity of a pad foundation model by 100%\u00a0and 150% with 133.33% of sand relative density. It showed that the increase of the sand relative\u00a0density inside the geotextile pillow was directly proportional to the increase of the bearing capacity\u00a0of the pad foundation model.<\/p>\n