 The microfibral angle of secondary cell wall in flax fibres affects their mechanical properties, so studying this relationship is crucial. This paper used x-ray diffraction and scanning electron microscopy to investigate MFA in seven flax fibres and found no significant difference between the two methods, with a good linear correlation, greater than 0.9, between them. This article was authored by Chun Hong Wang, N.I. Wang, Shohan Yu, and others.