The authors successfully employ an automatic centroid moment tensor inversion system to infer the centoid moment tensors of the Yutian MS 7. 3 earthquakes，Xinjiang using regional seismic waveforms (4° ＜ Δ ＜ 12°) observed by the virtual China Seismic Networks，which has been recently set up． The results indicate that this event occurred on a rupture plane ( strike 243°，dip 70°，and rake － 18°)，showing a left-lateral strike-slip mechanism with minor normalfaulting component． The centroid in the horizontal direction is located at nearly 13km east of the epicenter (36. 123°N，82. 499°E)，and the best-fitting centroid depth is round 10km． The total scalar moment，M0，is retrieved with an average value of 3. 05 × 1019N·m (or moment magnitude MW6. 92)． Most of the energy is released within about 14s． Moreover，we discuss about the future application of the automatic centroid moment tensor inversion system in earthquake disaster decision．