FRS-XRSA (Full -Reciprocal Space X-Ray Scattering Analysis) is a new procedure to characterize the crystallinity and orientation of various preferred orientation polymers. FRS-XRSA overcomes the difficulty of sample orientation when the crystallinity of orientated sample is measured by the powder method (PM).FRS-XRSA can also study the crystallinity of the deformed sample in the stretching and recovery processes. In our work

we measured XRS in two directions

i. e. latitude angle β =0° (MD) and 90 ° (TD) and △α=10°.Thus MT-XRS crystallinity Xxc was obtained.Here an approximation was assumed

i.e.the distribution of XRS from M to T direction was monotonous and smooth.But usually that is impossible.Therefore

an improvement of FRS-XRSA was made as follows.First

according to the intensity distribution of FRS-XRS

the inserted XRS intensities in αi

βi=0～90° at △αi

△βi=10°

were obtained

then FRS-XRS crystallinity Xxc

which accords with the theoritical basis

can be calculated.Second

the correction factor of polar angle cosxiwas considered in FRS-XRS.Third

the strange-point at αi=0° where cosx is zero

was dealt with reasonably.The results are reasonable and satisfatory.Meanwhile

the distribution of the crystallite size in FRS was obtained.