Three models, based on Chou抯 general geometric thermodynamic model, to predict the viscosity of ternary metallic melts have been established. The calculation equations of the model have been deduced. The experimental viscosity data of Ag-Au-Cu systems were used to verify the models and the calculation results with the models are consistent with the reported experimental data. The advantages, requirement and applicability of the models have been analyzed and com-pared. The models have also been utilized to predict the viscosity of Ag-Sn-Cu system. The vis-cosity of the system was experimentally measured and the results are consistent with the calcu-lated value of the models. Three models, based on Chou’s general geometric thermodynamic model, to predict the viscosity of ternary metallic melts have been established. The calculation equations of the model have been deduced. The experimental viscosity data of Ag-Au-Cu systems were used to verify the models and the calculation results with the models are consistent with the reported experimental data. The advantages, requirement and applicability of the models have been analyzed and com-pared. The models have also been utilized to predict the viscosity of Ag-Sn-Cu system The vis-cosity of the system was experimentally measured and the results are consistent with the calcu-lated value of the models.