Considering the complex source rupture process from Zhang Yong （2015）, the hybrid broadband simulation method was applied to synthesize the ground motions for the Ludian earthquake based on kinematic source model. The simulation results of representative sites were compared with the observed strong motion recordings, and impacts from three different source rupture models on strong ground motions were analyzed. The results show that for moderate earthquakes with limited fault dimension, the differences of strong ground motion characteristics among different source rupture models with the similar seismic moment are not obvious in the far fields, but are distinct in the near-fields. In addition, the distributions of intensity measurements of ground motions are given, and it is found that source rupture model plays an important role in the spatial distribution pattern of strong ground motions and strong ground motion characteristics. Therefore, the elaborate source rupture models are very important to estimate the strong ground motion characteristics and seismic hazard analysis in the near field.