Abstract: Modern seismic studies rely on reliable three-component seismological observations, whether the station sensor’s north component strictly aligns to the geographical north will directly affect the accuracy of the research. However, this parameter is easily subjected to error imposed by magnetic anomalies near the station or by human error. In this study, the component azimuths of 154 permanent seismic stations in Northeast China were rechecked using the P-wave particle motions of 2020 teleseismic events, and we used the same seismic events to calculate the component azimuth by the principal component analysis and the signal-to-noise-weighted-multievent method, respectively. The misorientations determined by these two methods are very consistent, with a correlation coefficient of 0.9986. Among the 154 stations, 84% of the stations deviate slightly from the true north, and some of the stations have some sort of problems, including misorientation of the two horizontal components （＞±20°） or polarity reversal in one or more components. We found a large deviation in sensor orientation could result in H-κ searching becoming unstable and even incorrect estimating of both crustal thickness and Vp/Vs ratio. Therefore, the orientation of the stations needs to be checked and corrected periodically.