Li2O-B2O3-SiO2 (LBS) synthesized via a solid-state reaction process was chosen as a novel sintering aid for tungsten-bronze-type Ba4Nd9.3Ti18O54 (BNT) ceramic. The effects of LBS additions on the sintering behaviors, microstructures, and microwave dielectric properties of the BNT ceramic have been investigated, indicating that LBS addition obviously lowered the sintering temperature of the BNT ceramic without damaging its microwave dielectric properties. BNT ceramic doped with 3 wt.% and 4 wt.% LBS addition could be well sintered at 975A degrees C and 950A degrees C for 3 h and had excellent properties: epsilon (r) = 65.99, Q x f = 4943 GHz (f = 4.4 GHz), tau (f) = 19 ppm/A degrees C, and epsilon (r) = 64.56, Q x f = 4929 GHz (f = 4.3 GHz), tau (f) = 11 ppm/A degrees C, respectively.