The utility model discloses a with temperature changes's material reflectivity dynamic measurement system, include and measure sample, spectroscope, reflective light intensity change test system and temperature data test system, measure the sample and be connected with the reflective light intensity change test system or the temperature data test system that correspond respectively that be provided with the photoelectric conversion trigger between reflective light intensity change test system and the temperature data test system, the photoelectric conversion trigger is connected with reflective light intensity change test system and temperature data test system simultaneously. This system can acquire the laser irradiation in -process, and metal material, pottery and high -molecular polymer material spatial position have the reflectivity with temperature changes curve of more accurate corresponding relation characteristic points, realize the analysis and the aassessment of material laser irradiation fuel factor, provides the basis for optimizing laser parameter among the laser processing process such as laser cutting, laser washing, reaches metal material 0 such as improving laser energy volume utilization efficiency, reduction processing cost.