Abstract: In this peper, the authors discuss the ore-bound principle of strain energy and ore solution migration under a specific tectonic stress field that prevaiced during mi neralization. It is thought that strain energy and migration potential are controlled by the sum and difference of the principal stresses (σ₁+σ₂), (σ₁-σ₂).Photoelastic experiments of four typical structures under different boundary conditions indicate that the movement and concentration of ore-forming fluid is closely related to the tectonic stress field:the ore deposits are most likely to form where the strain energy gradient is steep or the fluid migration potential is low.Some examples of the typical structures are given.