There are rhythmic skarn zoning, mainly magnesian skarns and calcic skarns, in contract metasomtites between Yanshanian granites and Triassic carbonate rocks in the Tangziwa deposit, Gejiu. The magnesian skarns and calcic skarns were located in the contract by turns form inner side to outer side accompanying the variety of mineral association and chemical composition. The mineral association of magnesian skarns are mainly diopside with relatively high content of SiO2 and MgO, and that of calcic skarns are mainly garnets with relatively high content of CaO, TFe and Al2O3. The writers think that this occurrence of the rhythmic skarn zonation in contract are mainly related to the two factors, one is to the rhythmic strata of calcic dolomite and marble in wallrocks, and the other to the infiltration metasomatism of post-magmatic hydrothermalism.