The Yb³⁺/Al³⁺-codoped silica glasses were prepared by the SiCl_4h ydrolysis doping and powder melting technology based on the high frequency plasma.The X ray diffraction (XRD),Fourie r transform infrared spectroscopy analyzer and thermal expansion analyzer are used for the characterizat ion of the structural, physical and spectral properties of the prepared Yb³⁺/Al3+ -codoped silica glass samples.The results show that the prepared Yb³⁺/Al³⁺-codoped silica glasses are close t o t he pure silica glasses in the density and refractive index.They have good glassy state,the thermal expansion coef ficient of 2.87×10－6,good doping uniformity of Yb³⁺ ion and Al³⁺ ion,and the typical absorption and e mission characteristics of Yb³⁺ ion.It shows that the prepared Yb³⁺/Al³⁺-codoped silica glasses using this metho d have the potential of high power laser materials.