A code of the terahertz wave’s atmospheric transmission and dispersive attenuation was developed with the radiation transmission theory and Van-Vleck Weisskopf line-shape based on the JPL database. The short term THz wave atmospheric transmission experimental results obtained from the THz-time domain spectroscopy (THz-TDS) technique was analyzed by this code. The absorbing attenuation characteristics and the time domain waveform of the terahertz transmission pulses were compared. The influence of the humidity on the amplitude, phase and spectrum of the transient terahertz pulse was studied. It was concluded that the maximum wireless transmission data rate exceeds 20 Gb/s between 0.1 and 0.5 THz, which is much faster than through the single mode fiber (SMF) and more suitable for short distance communication.