Why line with control points go wild when be applied makesubdfriendly

Dear All.
I have met a problem when I want to get a smooth subd curve from polyline with nurbs corner in order to extrude it with less kinks. The control points go mad when I applied the command. The image showed below demonstrate what I got. Does any professor know how to solve this problem?
Many thanks in advance!

break the curve into its individual parts and then rebuild each part to subd friendly. this will preserve your hard corners.

Hi, thanks Kyle!
I have asked several friends, It seems this is the only way to avoid problems:)

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