Abstract: Seismic moment tensor is an important part of seismology study, which supplies indispensable information for earthquake research. Fast acquisition of seismic moment tensor solution could be the key of post-earthquake relief and tendency determination. Based on the moment tensor inversion package from Nevada Seismology Laboratory, using JAVA and HTML language, we developed a near real-time full waveform moment tensor inversion system, which could fast output seismic moment tensor. Triggered by the Earthquakes Instant Messenger (EQIM), the system could inverse seismic moment tensor of moderate earthquakes automatically, also could be corrected manually, and offer web services in the end. Comparison has been made between our results and published ones by USGS and Institute of Geophysics, China Earthquake Administration, verifying the reliability of this system.