Abstract: In a 1.072-liter reactor under the condition of 8.5MPa and 4℃, gas hydrates formation process in three types of gas mixtures: laboratory syngas, Green Canyon gas and domestic actual field gas, was investigated with low dosage inhibitors Inhibex 501 and GHI1. The results show that the gas hydrate formation order is different when adding Inhibex 501 and GHI1; the temperature rises obviously twice after adding Inhibex 501. It is thought gas hydrate formation order is influenced by not only driving fore, but also low dosage hydrate inhibitors, which is decided by operating conditions; low dosage inhibitors have different inhibition ability to different gas components.