Influence of Li2O.4B2O3 frit addition on the microstructure and thermal expansion properties of $eta$-eucryptite ceramics was studied. With 1.0~10.0wt% frit addition, sintering temperature range was enlarged and densified body was obtained. Thermal expansion was increased from -6.67$ imes$10-6 $^{circ}C$-1 of pure sintered body to 1.03$ imes$10-6$^{circ}C$-1 of 6 wt% added body, but this increasement was accompanied by inhibition of thermal expansion anisotropy, so that improved microcracking property.