Cashew phenol ether ammonium sulfate/n-butanol/alkane/water pseudo-three phase diagram, emulsifying properties and foaming properties have been investigated. The results show that, cashew phenol polyoxyethylene ether ammonium sulfate/n-butanol/alkane/water system pseudo ternary phase diagram can form little range of liquid crystal area and a wide range of O/W microemulsion region. Emulsify property was enhanced with increasing water hardness, and emulsified order is hard water>0.5 mol?L-1 sodium chloride>0.1 mol?L-1 sodium chloride>deionized water, and cashew phenol polyoxyethylene ether ammonium sulfate had low foaming property.