In order to improve the stability of laser cladding reparation property, several single-factor tests are carried out for GH4169 nickel-based superalloy by controlling the dilution ratio. The result shows that within certain parameter range, the dilution ratio increases with the increase of laser power or the decrease of feeding speed, and the scanning speed may have little influence. In order to simplify the study process of dilution ratio, this paper puts forward the concept of powder-heat-absorption density, which means the laser energy absorbed by a unit mass of powder during the process of laser cladding, establishes the positive correlation between the powder heat absorption and dilution ratio with the combination between laser power and power feeding speed. By using the regression thoughts and with the data analysis about the test results by SPSS software, the relation model between powder heat absorption and dilution ratio is established and the accuracy is verified, which provides the theoretical references and test support about the study of stability of laser cladding reparation property of nickel-based superalloy.