Abstract: Preparation of renewable fuel was studied with saponificated China tallow seed oil and stillingia oil as raw materials using microwave pyrolysis. The effects of reaction power and temperature on the yield of pyrolysis products were investigated. The optimum conditions were obtained as pyrolysis power 700 W, pyrolysis temperature 450 ℃. The corresponding liquid yields were 75.26% and 77.01% for microwave pyrolysis oil from saponificated China tallow seed oil and stillingia oil, respectively. The GC-MS analysis indicated that the main components of the product were C8-C18 alkanes, alkenes, ring-containing alkanes and aromatic hydrocarbon. Pyrolysis oil properties were also determined. The results indicated that the pyrolysis oil from saponificated China tallow seed oil had higher heat value, lower density and viscosity with the comparation of pyrolysis oil from saponificated China tallow stillingia oil, which was similar to 0# diesel. Freezing point and cold filter plugging point of the pyrolytic products have good low temperature fluidity, which are better than those of the biodiesel.