The effects of Al substitution for Fe on the structure， the magnetism， the magnetostriction， the anisotropy and the spin reorientation of a series of Tb0.3Dy0.6Pr0.1（Fe1-xAlx）1.95 alloys （x=0.05，0.1，0.15，0.2，0.25，0.3） at room temperature are investigated. It is found that the compositions of Tb0.3Dy0.6Pr0.1（Fe1-xAlx）1.95 substantially retain MgCu2-type C-15 cubic Laves phase structure when xx=0.2 and the mixture phase increases with x increasing. The lattice constants increase linearly， Curie temperature decreases gradually and the coercive force decreases sharply with x increasing. The vibrating sample magnetormeter measurements show that the relationship between magnetization and substitution x is rather ambiguous. The magnetostriction of the Tb0.3Dy0.6Pr0.1（Fe1-xAlx）1.95 alloys decreases drastically with x increasing and the magnetostrictive effect disappears when x>0.15. However， a small amount of Al substitution is beneficial to a decrease in magnetocrystalline anisotropy. The analysis of the Mssbauer spectra indicates that the easy magnetization direction in the 110 plane deviates slightly from the main axis of symmetry with the increase of Al concentration x，namely spin reorientation takes place, thereby leading to the change of macroscopical magnetism and magetostriction.