The surface crack growth and dispersion in layered salt rock under uniaxial compression are studied by fluorescence and mesomechanical techniques; the differences of physico-mechanical properties of salt rock at home and abroad are briefly analyzed. The experimental results show: for pure salt rock

the surface cracks are mainly sliding cracks between salt grains. Destructive macro cracks are shapes with expand and joint coalescence of cracks between salt grains which impacted by size and uniformity of distribution of salt grains

strength and deformation of salt rock grains abroad are greater than domestic salt rock. For pure intercalation salt rock

the surface crack grown at the mixture of several mineral deposits

and which distribution effected by interlayer mineral composition and structure. For laminated salt rock

the surface crack distribution is effected by form of interfacial transition between interlayer interface and salt rocks. Generally

the serrated cracks mainly form by the main crack expansion to interlayer; the cracks with transition clearly and containing a thin layer of mud form by main crack and mud layers loose cracks assemble and expanding