To investigate the performance optimization methods of Quantum Interferometric Radar (QIR) under snowy conditions, a dynamic photon number adjustment strategy for the QIR system has been proposed based on the decoy-state quantum key distribution protocol and the Photon Number Adaptive (PNA) algorithm. The impact of snowfall on the detection of quantum light has been studied, as well as the relationship between the performance parameters of the QIR system and the intensity of snowfall before and after the application of the PNA strategy. Experimental results indicate that the QIR system, after applying the PNA strategy, is capable of automatically adjusting the number of emitted photons in response to changes in snowfall intensity. This adjustment leads to improvements in resolution, sensitivity, and survival function performance compared to the original system. The effectiveness of the adjustment strategy has been verified, providing a new method for enhancing the atmospheric interference resistance of Quantum Interferometric Radar.