The purpose of this study is to preparing high heat value fuels. In present investigation, sodium soap made from microalgae oil was used as the experimental material with significant molecular polarity, then by using microwave heating technology, which may preferentially activate the polar molecule and functional groups of the soap molecular, leading to the high selectivity of decarboxylation. The hydrocarbon content arrived maximum in 900W, when was investigated in different microwave radiation power, obtained pyrolysis liquid similar with high heat value fuel. The hydrocarbon content were usually above 70%. In addition, its density and dynamic viscosity are 0.845-0.870g/cm3 and 2.15-2.70mm2/s.