Abstract: The properties of working gases in gas detectors, such as the average ionization energy, Fano factor, and drift velocity, have a significant impact on the preliminary simulation, parameter design, and trajectory reconstruction of the detectors. SeF₆, as the target working gas in domestic neutrinoless double beta decay experiments, has unknown parameters that need to be investigated. To study the relevant parameters of this gas, a measurement scheme was designed and the accuracy and reliability of the experimental plan were tested using Ar+10%CH₄(P10) as the working gas. In the experiment, the average ionization energy of P10 was measured using a grid ionization chamber with an \alpha source, yielding a value of 27.46±0.05 eV, and the Fano factor was determined to be 0.181±0.001 when the energy resolution reached 0.91% after subtracting noise through calibration electronics. Additionally, the drift velocity was measured using a 266 nm laser and a time projection chamber, and the results were consistent with the Garfield++ simulation results. The experimental results indicate the feasibility of the measurement scheme and demonstrate high reliability of the measurement results. This provides a solid foundation for further research on the properties of SeF₆.