The influence of alkaline fluorides on spectroscopic properties and crystalization stability of Yb3+-doped fluorophosphate glasses was studied. Emission cross section of Yb3＋ is calculated based on reciprocity method. Results show that LiF increases the absorption and emission cross section and has optimal introduction amount, and the second is KF. Alkaline fluorides improve the crystalization stability of binary system and strengthen the glass network. Raman spectra show that YbF3 strengthens the glass network of binary system, but destroys that of the ternary system with alkaline fluorides and reduces the crystalization stability.