The counting rate (CR) is critical for superconducting nanowire single-photon detector (SNSPD). This study presents a method for improving the CR of SNSPD at room temperature. Based on a distributed circuit model of the SNSPD system, the influencing factors of signal integrity and CR are simulated and analyzed. By introducing a flexible wire with very low heat leakage, the problem of signal integrity is solved, and the CR can be increased by the series resistor at room temperature. The CR of the device is increased by 5.3 times through a 150 Ω series resistor at room temperature without affecting the detection efficiency and dark count rate of the SNSPD system. The proposed method is simple and satisfies the requirements of increasing the CR of SNSPD in real time.