Physicochemical properties and composition of pyrolysis liquid for oxytetracycline mycelium are analyzed by using elemental analyzer, moisture tester, viscometer and GC-MS etc. . The C content of pyrolysis oil phase is up to more than 50%, the N and O content are 6. 48% and 27. 89% of the pyrolysis oil phase; the N and O content are 7. 89% and 13. 54% of the pyrolysis aqueous phase, respectively. The viscosity of oil phase of pyrolysis liquid which temperature arrange from 300 to 600 ℃ is between 6 980 mPa·s and 8 913 mPa·s, and the viscosity of aqueous phase is between 324 mPa·s and 372 mPa·s. The density of oil phase in pyrolysis liquid is between 1. 089 8 g/cm³ and 1. 127 9 g/cm³, and the density of aqueous phase is from 1. 041 9 g/cm³ to 1. 075 6 g/cm³. The nitrile material in pyrolysis liquid are relative higher, accounted for 23. 69% and 9. 32% in oil phase and aqueous phase, respectively; the alkaline nitride in pyrolysis oil phase and aqueous accounted for 0. 83% and 1. 46%; The non-basic nitrides in oil phase and aqueous phase pyrolysis accounted for 1. 56% and 0. 35%; the rest of the organic -〓〓收稿日期: 2013-05-16; 修回日期: 2013-06-26; 责任编辑: 王海云基金项目: 国家环保部环保公益性行业科研专项(201109004)作者简介: 陈〓昆(1985-), 男, 河北冀州人, 硕士研究生, 主要从事大气污染控制和固体废物资源化方面的研究。通讯作者: 郭〓斌教授。E-mail: Gbin69@163. commatter in oil phase and aqueous phase accounted for 3. 30% and 4. 11%. Above results may provid technical guidance for further resource utilization.