The Nd3+, Yb3+-doped and Nd3+-Yb3+-codoped high silica glasses (HSGs) were fabricated by sintering porous glasses impregnated with Nd3+ and Yb3+ ions solutions. The Judd-Ofelt theory was used to study the spectroscopic properties of Nd3+-doped HSGs. Large parameter Omega(2) of Nd3+-doped HSGs suggests a lower centrosymmetric coordination environment around the Nd3+ in HSG. The spontaneous emission probability and emission cross-section (sigma(em)) of Yb3+-doped HSGs are obtained. A broad emission band from 950 to 1,100 nm was detected when the Nd3+-Yb3+-codoped HSG was excited by 808 nm LD. The energy transfer process from Nd3+ to Yb3+ in HSG was described in this paper.