Fused quartz ceramic was prepared in reducing atmosphere at 1300°C, 1400°C and 1500°C for 1h with fused quartz powder as raw materials (size<0.2mm). The effect of La2O3, Nd2O3, Er2O3 and Yb2O3 on crystallization and sintering of the materials were researched by measurements of apparent porosity, bending strength and thermal expansion rate (RT~1200°C), and analyses of XRD and SEM. The results showed that La2O3 and Nd2O3 have a few facilitating effect on sintering, Er2O3 and Yb2O3 have better facilitating effect on sintering of fused quartz ceramic samples, samples ER and YB have lower apparent porosity and higher bending strength and more compact microstructure. So additives La2O3, Nd2O3 and Er2O3 have a few effect of inhibiting on crystallization, Yb2O3 has better effect of inhibiting on crystallization of fused quartz. Sample YB has least thermal expansion rate.