This work is devoted to increase the functional properties of polyester fabric such as UPF, moisture regain, tensile strength at break and dyeability towards basic dye. To achieve this purpose polyester fabric were modified with different concentrations bentonite nano-particles (BNPs) using pad – dry curing technique and IR dyeing machine. The effect of the (BNPs) on the physical and mechanical properties of the treated fabrics such as moisture regain, tensile strength at break, elongation percentage and thickness were investigated. Topographical investigation of the said nano-particles was conducted using transmission electron microscopy (TEM). The surface morphology and surface chemical elements of the treated as well as the untreated fabrics were investigated using field emission scanning electron microscopy and dispersive X-ray spectroscopy, respectively. FTIR, thermogravimetric analysis and UPF of the treated polyester fabrics compared to the untreated one were assessed. The colour strength of dyed polyester fabrics with both disperse and cationic dyestuffs as well as the fastness properties were evaluated. Excellent results of the treated fabrics toward physical and coloration properties were obtained.