Stress chemistry is the science that studies stress nature, action manner and scale of stress and association and order of stresses chemical actions and processes generated by their occur-rence, development and evolution, as well as the physico-chemical dynamic mechanism between the stress and chemistry. According to stress nature, stress chemistry may be divided mainly into four types: tensile, compressive, shear and rotation-shear stress chemistry. Stress action is not simple and homogeneous but complex. Different stress dispositions have different chemical ac-tions, of which the chemical action caused by differenial, tenso-shear and alternating stress action is more important. When the stress acts on geological structural body, one of action mammers that receive and release energy is stress chemical action. Stress chemical action effects ummixing of solid solution, mineral disintegration, new mineral formation, recrystallization, partial gather-ing of the composition, corrosion-cracking, etc. Stress action can also enhences dissolubility, dif-fusion , permeability and migration of materials and can transform acid-alkali and reduction-oxi-dation environments. In a word, stress action can generate, promote and quicken chemical action and improve many conditions required by chemical actions. Its research has very important theo-retical and practical significance.