A series of new multi-component glasses of 0.70TeO2-(0.20-x)ZnO-xGeO2-0.05La2O3-0.025K2O-0.025Na2O-0.01Yb2O3 (mole fraction x=0, 0.05, 0.10, 0.15, 0.20) were presented. Thermal stability of the system, spectra and laser properties of Yb3+ ions were measured. The result shows that the composition glass of x=0.20 has good thermal stability, large stimulated emission cross-section of 1.23 pm2 for the 2F5/2→2F7/2 transition, longer fluorescence lifetime of 0.92 ms, broad fluorescence effective linewidth of 77 nm and minimize pump intensity of 0.98 kW/cm2. Evaluated from the good potential laser parameters, it is desirable for high-average power and short pulse tunable laser.