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We present how to obtain the forward linear birefringence and the angle increment of birefringent axis distributions from the round-trip local birefringence vector by using P-OTDR technique. Further we can use these data to calculate the DGD distribution in two ways, one is to show the DGD for every fiber sections and the other is to show the DGD evolution along the fiber. The experimental results are in good agreement with the theoretical results and the result measured using JME method.