To balance the requirements for lifetime, cross section and crystallization stability in rare-earth-doped fluorophosphate(FP) glass, we studied the influence of LiF and AlF3 on the properties of FP. Results indicate that LiF plays an important role in improving the radiative lifetime of Tm3+, and the glass performs good crystallization stability with LiF proportion as high as 30mol%. Crystallization stability in high AlF3 glass is excellent but the radiative lifetime of Tm3+decreases fast. Emission cross section changes mildly with the variation of LiF and AlF3 proportions, so lifetime, cross section and crystallization stability can achieve their batter values through the ajustment of LiF and AlF3 proportions.Comparations between J-O parameters and several properties of the Tm3+ doped FP glass show that with AlF3 increasing, the overlap integral of 4f and 5d orbitals of the rare earth ions increases. Raman spectra testify the great variation of glass structure when LiF and AlF3 contents change largely.