Abstract: The formula of hot deformation process criterion has been put forward.That is f(T,ε°)=T2/(211539.9lgε°+18957488ε).It suggested that if f(T,)≤1,samples must break down at the beginning stage of hot deformation,and the effective strain is greatly lowered .If f1,I(006) /I(105) is improved as the total strain ε° is raised and other diffraction intensity ratio I/I Mas is decreased sharply. Under conditions of T≥1173K,there esists a relationship: I(006)/I(105) =0 983ε°+0465. Remances of the magets are higher than those deformed in f≤1. Under the Conditions of T1173 K and f1,006 magnetic texture was obtained for the first time. At this temperature,stress of intercrystalline,Pr 2Fe 14 B,is lower than that of grain boundary,two phase eutectic. Lower is benificial to the sliding over (001) crystal face. For the grains that stopped sliding over (105),they can be continuously slided over (001),thus the 006 texture are achieved. But (105) is adapt to the other conditions,such as,f(T,)≤1 and T≥1173K,whether f(T,ε°)≤1 or 1. No matter what conditions,there exist lattice distortion,atom disorder and stacking fault in Pr₂Fe₁₄B and grain boundary phase during deformation,which can all be eliminated by suitable heat treatment.