The results of thermodynamic investigations and characterization of some alloys in ternary Pb-Au-Bi system are presented in this paper. Partial and integral molar quantities were determined in the temperature range of 873～973 K, based on the comparative thermodynamic analysis done experimentally using Oelsen calorimetry and analytically using Redlich-Kister-Muggianu model. Characterization of chosen lead-based ternary alloys were done using DTA, XRD and SEM analysis.