This paper introduces a kind of biomass pyrolysis set based on fluidized-bed, which has such characteristics as feeding feedstock with two screw feeders and cooling hot pyrolysis steam with spraying of bio-oil .Experimental result shows that the developed pyrolysis set is available to convert biomass into bio-oil and all biomass have an optimal temperature for maximum bio-oil yields. For instance, bio-oil yields of sawdust, rice husk, corn stalk and cotton stalk are 63% ,53% ,57% and 56% respectively at optimal pyrolysis temperature. The analysis indicates that the calorific value of bio-oil is about 17 MJ/kg and bio-oil is a mixture of water and oxygenic compounds including almost all chemical categories. The research also shows that drying biomass can effectively reduce the moisture in bio-oil, and the bio-oil stored for half a year still can be used as fuel oil.