A sets of experiments were done on a vertical environmental (EV) burner with fixed coflow air of 873 Lit /min to ensure turbulent lean premixed flow in order to study the effect of additon of argon mixture to the Liquefied Petroleum Gas on the temperature distributions and flame structure. The environmental (EV) burner assembly was fixed vertically in the test rig to scan the flame radially and axially. The flow rate of fuels, diluent and air were measured using rotameters.The whole supply lines were calibrated. The mixture of gases, air were injected through mixing pipes controlled with solenoid valves handled with a Labview program.The combustion flame was in room atmospheric conditions. The turbulent flame axial, radial temperature profile was measured using a shielded Platinum thermocouple type S. Flame images were taken using high resolution Canon 6D digital camera with high resolution lens .The fuel used was mixtures of different fuels of LPG, Argon. The choice of the different investigated cases was based on flame stability. The axial, radial distributions of mean gas and exhaust temperature,smoke number,NOx and combustion efficiency, are presented and analyzed for selective cases.The results obtained indicate the following: for pure LPG flames the images show short light blue flames at low flow rates and with progressive increase of the fuel flow rate this color changed to dark blue flame then to yellowish and white luminous zone.The exhaust temperature ranges was increasing with increasing of fuel flow rate of LPG. By Ar addition the flame luminosity decreases with the increase of Ar dilution, also the flame length increased in all runs with the progressive increase of Argon flow rate while decreasing the soot formation, while the NOx trend, exhaust temperature and combustion efficiency decreased by increasing Argon percentage addition.