A method of plasma heated biomass fast pyrolysis liquefaction was reported. The very high heating rate could cause the cracking of the long chain molecular structure in biomass. The solid-state biomass then was converted into liquid state. The biomass used in experiments was pulverized com stork. The experimental results showed that this kind of liquefaction technique was effective. Under proper conditions, more than 50% of corn stork could be converted into liquid, the bio-oil. A prototype has been constructed according to the test results.