To further investigate the influencing factors of Terahertz radiation generated by femtosecond laser-excited water lines,experiments are conducted to study the effects of laser power, the position of the laser focus within the water line, and water line temperature on the Terahertz radiation power. The experimental results indicate that as the laser power increases, the Terahertz radiation power also increases accordingly, but the conversion efficiency decreases. Compared to the center of the water line, the Terahertz wave radiation power is higher at the edges of the water line. Additionally, as the temperature of the water line increases, the Terahertz wave radiation power at the center of the water line also rises. Furthermore, by establishing a two-dimensional plane model of the water line and the adjacent air domain and calculating the distribution of Terahertz electric field intensity, it is found that as the frequency of the Terahertz wave increases, the electric field intensity of the Terahertz wave radiated into the air also increases accordingly.