This research addresses the structural effectiveness and thermal endurance of R.C. columns confined by CFRP and subjected to elevated temperature; nine different insulating materials have been tested to protect CFRP sheets and its epoxy resin. An experimental program has been conducted to investigate the effect of different temperature levels "below100oc, 100oc, 200oc, 250oc, 300oc, and at 350oc" and durations "4, 8, 12, and 24 hours" on the structural performance of R.C. square columns. Subsequently, evaluate the effectiveness of different thermal protection materials in increasing their thermal endurance and decrease the heat transfer rate to reach CFRP surface. A total of 19 R.C. square columns were tested thermally using an electric furnace which constructed to serve this experimental program, it has special specifications for this specific purpose, and it is designed to have ultimate temperature equal 1000oc, subsequently, tested after being cold under a monotonic axial compression load to measure its residual capacity.