Abstract: Five types of lignocellulosic materials, i.e., ginkgo wood, fir wood,wheat straw, rice straw, corn cob, which are representative of woody materials and grass ones, were routinely pyrolyzed in nitrogen atmosphere. During pyrolysis reaction, the gaseous products were in-line detected by gas chromatography. The condensed products were analyzed by GC-MS.The water content in pyrolytic liquid products were measured by Karl-Fischer method. The results showed that the yield of solid char is about 30% for both of the woody and grassy materials. The yield of the liquid products from the woody materials was 33%-42% lower than that from the grassy ones(45%-51%), while the yield of the gaseous products from the woody materials was 30%-39% higher than that from the latter(18%-24%). The organic substances in the pyrolytic liquid products were mainly furan-type compounds and phenolic ones. The total content of the furan compounds from grassy materials were 25%-33%, which is higher than that from woody materials. The total content of phenolic compounds from gassy materials is 24%-30%. CO2 and CO are gaseous products mainly originated from the thermal decomposition of raw materials. CH4 and H2 were closely related to pyrolysis reaction of tar originated from raw materials and the structure formation of solid char.