Based on the short-leveling and short-baseline observation in Tangshan seismic station，the relationship between different combination of segments and the fault movement is discussed． And then the fault deformation coordination ratios are calculated and used to analyze the relation between their sharp deviation and the local med-strong earthquakes． The results show that: ( 1 ) The view on the fault movement would be different because of the different measurement-angle segments with the fault． So it is necessary to calculate and compare the different combinations if the data are suitable． At the same time it is proved that different segments along the same fault are essential to study the fault movement． For the Tangshan seismic station，the combination with two small angle segments data is better than others，which may be the result of the strike-slip fault and horizontal local strain． ( 2 ) The four fault deformation coordination ratio series have similar trends although their amplitudes vary greatly． The sharp deviation to the normal level appeared alternately with the Tangshan med-strong earthquakes (M ≥4． 5)，and the time intervals last longer gradually as time goes after 2000． That may reflect that the local strain in the 1980s ～ 1990s was in their modification period of the great Tangshan earthquake，and after 2000，the regional strain becomes steady．