Abstract: Some liguid laser solutions containing Nd³⁺ ion were prepared in inorganic solvents. It was found that the composition and proportion of the solvents in the solution reveal an influence on the viscosity, lifetime of ⁴F_3/2 energy level for Nd³⁺ ion and output of laser energy.The high stability of the Nd³⁺ complex and the long lifetime of the energy level for Nd³⁺ ion are considered to be caused by three factors:the first coordinated sphere for Nd³⁺ ion is occupied by oxygen atoms, the solvation of the Nd³⁺-containing complexes with POCl₃ molecules and the formation of =O→SnCl₄ (donor acceptor) bonding.