The glass material of low-temperature co-fired ceramics (LTCC) has an important influence on the performance of the substrate. In this paper, the properties of the co-fired glass materials used in LTCC were introduced, the influences of component and preparation process on the material properties were summarized, and the existing mature systems were analyzed. The superior dielectric properties of CaO-B2O3-SiO2 glass-ceramic system are due to the presence of the massive crystal phases. However, the components and preparation process fluctuations have a great influence on the properties due to its sensitive sintering and crystallization behavior. The structure of PbO-B2O3-SiO2 glass/ceramic composite system is compact and the glass phase is not easy to crystallize. The material has a table properties and superior mechanical properties. However, its application in a high frequency field is restricted because of the massive leaded glass phases. The crystalline glass and ceramic filler composite can be used in La2O3-B2O3 glass/ceramic composite system for the performance and stability requirements. The sintering mechanism and performance adjustment laws of LTCC materials still need to be further investigated to support the expansion of existing systems and the development of new systems.