In order to effectively enhance and continuously control terahertz wave, we propose a method of modulating the spatial distribution of terahertz wave through external spatial interference. Firstly, we compare the spatial distribution when placing hollow metal waveguides with that when not placing hollow metal waveguides by means of theoretical calculation. The impact on the spatial distribution of terahertz wave is exhibited when changing the propagation path of terahertz wave under external interference. At the same time, we acquire the spatial distribution of terahertz wave which can be continuously regulated by changing the relative position of hollow metal waveguide and laser filament. The results mentioned above provide a new way for continuous regulation of wideband terahertz wave. The results show that the energy intensity of the strongest point in the spatial distribution of THz wave is increased by 5.9 times, which can provide reference for the continuous regulation of broadband terahertz wave.