As well known, sulfate and phosphate are widely used additives for MOC products. In this work, the influence of FeSO and KHPO on the properties of magnesium oxychloride cement (MOC) such as compressive strength, water resistance, thermal stability, composition and micro structure were studied in detail by using material testing system (MTS), X-Ray diffraction (XRD), thermogravimetry and differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP), respectively. The results show that both FeSO and KHPO incorporation can benefit the formation of gel-like 5Mg(OH)·MgCl·8HO (P5) and the water resistance of MOC. However, the FeSO and KHPO incorporation can downgrade the thermal stability and the mechanical strength. The influence of KHPO is more obvious than that of FeSO. In addition, the hindering hydration of MgO caused by sulfate and phosphate ions result in reduction of the hydration product, while the double hydrolysis reaction between Fe and MgCO leads to slight increase of the resultant in the slurry of MOC.