To ensure the accurate and consistent transfer of laser power scales， a direct comparison between the primary standard and the secondary standard for 0.1~100 mW laser power was conducted. The comparison was carried out under both broadband uniform irradiation condition and laser beam condition. Excellent agreement was achieved under uniform irradiation condition， with a relative deviation within -0.08% and an E _n value of -0.08. Under the laser beam condition， the initial relative deviation of the power realizations was -1.64%. The response uniformity of the primary standard and the secondary standard was experimentally investigated， revealing that the secondary reference device exhibited a measurable non-uniformity under laser beam conditions. After correcting the responsivity of the secondary standard based on the response uniformity， the relative deviation decreased to -0.26%. and the E _n value of -0.25， which achieved an excellent agreement for realization of the 0.1~100 mW laser power primary standard and the secondary standard.