Jaw crusher (named tiger mouth) appeared in 1858. First of all, jaw crusher machine is applied to road construction, then applied to mining machinery. The jaw rock crusher has crushing ratio, final product particle equality, simple structure, stable work, easily maintenance, cost economic etc. Jaw crusher is widely applied to mining machinery, metallurgy, building material, highway, railway, water conservancy and chemical industry etc. Many kind of material which crushing pressure less than 320 Mpa. Jaw crusher struction consist of fixed body, rotating body, safety device, adjusting device etc. The crushing cavity is deep and no block area, then improve the feed input and capacity. The crushing ratio, the final product particle is even. So these advantages shows jaw crusher is the best choice as primary crusher in stone crushing line.