Based on the similar principle of model tests and characteristics of soft rock in-situ, a new kind of similar material of soft rock which consists of clay, barite powder and gypsum is developed to simulate dynamic characteristics of prototype soft rock. Orthogonal test is carried out, and influential patterns of ingredients content on density, initial shear modulus G_max and reference strain γ_r are achieved via variance and range analysis method. Based on the results, an ultimate proportioning test is conducted. The test results indicate that the proportion of blanc fixe imposes primary effect of density of similar material. Reference strain γ_r increases as the content of gypsum increases and decreases as the content of clay increases. Initial shear modulus G_max of similar material decreases as the proportion of clay increases, while increases as the proportion of barite powder or gypsum increases. The relationship between dynamic stress and dynamic strain and shear wave velocity of the similar material shows great consistence with that of prototype.