High thermal effects on the Point load Index of rocks tolerates in mind an essential issue for numerous Geotechnical engineering purposes. This research aims to carry out Point load Index experimental studies of intact rocks as Aswan Granite, Sandstone, Marble and, Limestone rocks, that are subjected to thermal effects. Many engineering relevancies interaction with it as Geothermal power reserve extraction, Fires that occurs in tunnels, Underground coal gasification (UCG), and numerous ancient monuments that were made from these rocks and exposed to different thermal impacts from room temperature degree (25 oC) to a high temperature up to 1100 oC. The results are debated and introduced in terms of rising in temperature degrees with different parameters. It has been known that Point load Index of rocks decreased with the elevated temperature particularly outside particular temperatures.