Abstract: PbO-B₂O₃-based multicomponent glass additives were more effective to reduce the sintering temperature and maintain good microwave dielectric properties of （Pb,Ca,La）（Fe,Nb)O₃ （PCLFN） ceramics than pure glass with single component. Based on the glass formation theory and the energy minimum principle, the relations between the glass components and the microwave dielectric proper-ties of PCLFN ceramics were discussed. PbO-B₂O₃-based glass additives can reduce the sintering temperature of PCLFN ceramics by 100~150℃. When the PCLFN ceramics sintered in air at 1000~1050℃, its Qf is 3945~4796 GHz and K is 100. Different compositions also affected the microwave dielectric properties of PCLFN ceramics. Of the three PbO-B₂O₃-based glasses , PbO-B₂O₃-V₂O₅ glass is the best sintering aid.