Abstract: An analysis on the seismic performance of a high core-wall rockfill dam (HCRFD) is usually required for its safety operation in strong earthquake regions, and for such analysis deformation and stability are two important aspects. This paper describes a seismic analysis considering uncertainties in both dam material parameters and ground motion inputs. A fragility analytical method is used along with two performance parameters: relative seismic settlement ratio of dam crest and cumulative slippage. First, a Latin hypercube sampling method is used to select samples of multi-group material parameters, and then fragility analysis of a HCRFD under ground motions of several types at different earthquake intensity levels is made. Finally, using each of the two performance parameters, we obtain seismic fragility curves and probabilities of the dam at different performance levels. The results are thought to be helpful in seismic designs and decisions on the reinforcement or maintenance of HCRFDs.