Abstract: In order to realize the direct application of olefin cross-metathesis on preparation of long-chain terminal olefin compounds from the crude fatty acid esters of vegetable oils, methyl oleate(MO) and methyl linoleate(ML) were used as raw materials to prepare long-chain terminal olefin compounds 1-decene(CM1), 1-heptene(CM2) and methyl 9-decenoate(CM3) through olefin cross-metathesis reaction. 4 typical Grubbs catalysts, 10 short carbon chain fluid substrates were chosen and different reaction temperature, time, catalyst dosage and moles ratio of substrate as the reaction conditions were investigated and contrasted. The results showed that the second-generation Hovey-Grubbs catalyst(C3) and the second-generation Grubbs catalyst(C2) were suitable catalysts for raw materials MO and ML, respectively. Eugenol was the most appropriate partner among the 10 substrates for producing aim products. The influences of temperature, time, catalyst dosage and ratio of substrate were investigated, the suitable reaction conditions were reaction temperature 0 ℃, time 20-60 min, catalyst dosage 0.5%-1% and the mole ratio of fatty acid ester to substrates 1∶10-1∶20, the highest conversion of MO and ML were 99%, and the yields of CM1, CM2 and CM3 were 80%, 92% and 73%, respectively.