Evaporate, composed dominantly of varying proportions of halite, anhydrite and gypsum, have showed strong relationship with the ore-forming process, especially the magmatic-hydrothermal related deposit, but its detail affect have not been studied. Jinshandian iron skarn deposit has obvious minerals assemblages like anhydrite, gypsum, pyrite and scapolite, which were resourced from evaporate. The ranges ofδ34S values for evaporate related minerals are +16.2‰~+19.4‰ for pyrite（n=9), +24.9‰~+27.9‰ for anhydrite（n=10) and +27.5~+28.4‰（n=2）for gypsum, the latter two are closed to the strata of the Middle Triassic Series at the Middle Low Yangze River, suggesting that the evaporate had mainly offered sulfur for the ore-forming system. Sulfate–sulfide mineral fractionation is consistent with an approach to isotopic equilibrium, and calculated temperatures for coexisting anhydrite–pyrite pairs （n=6) are 563℃~728℃, which is much more higher than the temperatures gotten from fluid inclusions. Existing data shows that evaporate had joined in the ore-forming system at the stage of high temperate magmatic-hydrothermal or maybe more earlier. Cl content in scapolite are as high as 4%, indicated NaCl equiv （wt%) of the fluid could have reached 70%. Dissolution of evaporate have the effect of increasing the salinity of the fluid, which enhanced the capacity of leaching and transporting iron and the solubility of anhydrite. With amount of anhydrite joining in the ore-forming system, the oxidation state of the system were changed obviously, which was need by large amounts of magnetite depositing.