The effects of ordinary Portland cement (OPC) on setting time, mechanical behaviors and working performances, including water absorption, softness efficiency, corrosion-resistance and arasion-resistance of ceramic gypsum model, were investigated. The mechanisms were characterized with the measurements of X-ray diffraction, scanning electron microscopy (SEM) and DSC/TG. The results showed that the amount of water demand was reduced and the setting time was shortened by adding OPC. Besides, the strength at the later stage of hydration was significantly increased by the amount of OPC rising which remarkably enhanced the performances of corrosion-resistance, softness efficiency and arasion-resistance. The mechanisms indicated that CaSO4·2H2O(DH), AFt and C-S-H gel were the main hydration production. The interconnection between needle, clavuligerus DH and acicular AFt crystals together with the filling of C-S-H into pore space led to a more compacted crystal-gel microstructure, which enhanced the macro-performances of gypsum hardened paste. In addition, DTA-TG results indicated that the dehydration temperature of DH was also improved from 140 ℃ to 150 ℃ due to the more compact microstructure of gypsum hardened paste. What's more, the morphology of gypsume was modified to be grainy, noodles-shape and stumpy.