Abstract: Microfibril angles of bamboo cell wall in different part of culm have been measured by using X-ray diffraction(002)peaks. Its distribution shows that:(1)microfibril angle increases slightly along radial direction from the culm's surface to its interior part. The Ansade Cortex consists of amorphous material.(2)The microfibril angles of the different parts along vertical direction in the same internode are the same.(3)The relationship between microfibril angle(θ) and internode length(L) can be satisfactorily expressed as:L=b cos θ+a,in which a, b is constant respectively.

Key words: Microfibril angle, Bamboo, X-ray diffraction