XRD, mercury indicator and TGA were used to study fibers of carbon fiber from liquefied bamboo during carbonizing at 300~1 000 ℃, the results showed that both (002) crystal plane diffraction peak and (100) crystal plane diffraction peak appeared in the fibers at 300~l 0001, moreover, with rising of carbonization temperature, it was difficult for the fibers to be graphitized, but their graphite-like crystal structure became regular and orderly. The fibers porous structure changed obviously at 300-600 ℃, while their porous structure had smaller change at 600~1 000℃. The rate of weight loss of fiber was 5.07% below 300℃, its rate of weight loss reached 41.20% at 300~600℃, and was only 3.33% at 600~1 000℃.%对炭化温度在300～1 000℃之间的竹质碳纤维原丝进行研究,结果表明:原丝在300～1 000℃之间均出现了(002)衍射峰和(100)衍射峰,且随炭化温度的升高原丝难以石墨化,但其类石墨微晶结构随着炭化温度的升高逐渐趋于规整和有序.300 ～ 600℃是原丝孔隙结构发生显著变化的区间,600～1000℃间原丝的孔隙结构变化较小；300℃以下原丝的热失重率为5.07％,300 ～ 600℃间的热失重率达到41.20％,600～1000℃间的热失重率仅为3.33％.
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