Abstract Using the HASH method to calculate the source mechanism solutions for earthquakes above ML2.5 in the Hetao seismic zone and above ML2.0 in the Hoho depression from 2008 to 2020, and retaining the source mechanism solutions with better data quality results. Using grid search method to invert the stress field directions of three tectonic zones in the Hetao seismic zone, namely Linhe depression, Baiyanhua depression, and Huhe depression. The results showed that: 1) The stress field directions in the Linhe depression and the Hetao seismic belt are relatively consistent, and the compressive stress axis is distributed in a northeast direction; 2) Both Baiyanhua and Huhe depressions exhibit clockwise twisting changes, and the compressive stress axis is distributed in a northeast direction. It is speculated that due to the clockwise movement of the Ordos block in the direction of the pointer, the northeast edge of the Hetao seismic belt is subjected to southeast stretching, resulting in a regional difference in the direction of the stress field between Baiyanhua and Huhe depressions.