The Haicheng-Xiuyan region is an earthquake-prone area in Liaoning Province where earthquake sequences occurred frequently and is regarded to the regional seismic window． In this area we found many earthquake events with the highest waveform similarity in the records of the same station from some remarkable seismic sequences，namely repeating earthquake sequences． In principle rupture areas of the repeating events overlap with each other and are the most closely located． Therefore，these events may reflect the seismic process near the earthquake fault． In this paper，we identified 4 remarkable earthquake sequences of Haicheng-Xiuyan by waveform crosscorrelation． The result shows that the cumulative slip of repeating earthquakes is related with moderately strong earthquakes，among which Xiuyan MS5. 4 foreshock sequences has the most strong and apparent pre-shock accelerating-like slip behavior．