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A drawn high density polyethylene（HDPE）has been measured by Raman spectroscopy and differential scanning calorimetry （DSC）. The crystalline structure of drawn HDPE is analysed by the Raman internal modes in terms of mass fractions of the crystalline orthorhombic phase

the liquid- like amorphous phase and the disordered anisotropic phase. The mass fractions depend on draw temperature T

d

and draw ratio R

d

. The fraction of disordered anisotropic amorphous phase changes very little with

the T

d

and increases with increasing R

d

. Sum of the mass fractions of crystalline orthorhombic phase and the disordered anisotropic phase increases linearly as the same slope as the crystallinity W

c

determined from DSC measurements with increasing T

d

or R

d

and it is higher than the W

c

for all the samples. The results show that the mass fraction of disordered anisotropic phase is partially devoted by the taut tie molecules （TTM s） in the amorphous state. The dependence of the disordered anisotropic phase on T

d

and R

d

supports the mechanism of plastic deformation of fibre structure.