Abstract: 　　
　　In this study, we focus on the morphological features of the interhemispheric asymmetry and latitude offset phenomenon of the equatorial ionization anomaly (EIA) at equatorial and low-latitude magnetic regions in winter by statistics of the parameters -TEC and hmF2 around 120°E longitude during 1998-2020. The results showed that: (1) The hemispherical asymmetry features of EIA structure that vary with solar activity are significantly different during the summer and winter solstice. The asymmetry exhibits a significant correlation with the solar activity during winter solstice. However, there is a weak negative correlation during the summer solstice. (2) The latitude position of EIA structure moves southward in winter months and the latitude deviation of southern anomaly crest is more significant, especially during the low solar activity. The hemispherical asymmetry is mainly affected by the trans-equatorial neutral wind field during the winter solstice. On the other hand, photo-ionization can produce more electrons under the subsolar point, and the effect may plays an important role in Southward offset phenomenon of EIA structure in winter around 120°E longitude.