The effect of T substitution for Fe on the structure, spin reorientation and Mssbauer spectra of a series of Tb0.3Dy0.7(Fe0.9T0.1)1.95 (T=Mn，Fe，Co，B，Al，Ga) alloys at room temperature has been investigated systemically. The X-ray result shows that all samples are single phase having the cubic Laves-phase structure (C15). 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 for Al and Ga substitution, but remains in the ［111］ direction for B, Mn and Co substitution. The hyperfine field decreases slightly for Al and Ga substitution, does not change for B，Mn substitution and increases greatly for Co substitution. With the substitution of all elements but Co, the isomer shift and the quaduple splitting always increase.