Within the site of Juancheng Yellow River Crossing Bridge on DezhouShangqiu highway, the earthquake activity is frequent and there develop saturated silty and fine sand layers. By means of macro and micro judgement on the liquefaction tendency of the site, the article makes comprehensive estimations on the ground liquefaction of the site of the bridge, makes calculations of the ground liquefaction indexes and makes suggestions of the liquefaction levels. The article recommends that multiple methods should be used to estimate on the liquefaction of the sandy soils so as to improve the reliability of the liquefaction judgement.