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I find there is one compress PPP packet in GRE packet, so how to get the PPP packet without

encryption and compression ? thanks

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You seem to be asking the same question in a number of different ways, see eg… . Are you asking generally how to break PPTP encryption given only the ciphertext? – MadHatter Dec 1 '10 at 11:42
up vote 0 down vote accepted

pptp is isnt crypted (openvpn using ssl, but default pptp configuration isnt using) you can use ngrep or tcpdump or another sniffing to cache pakage.

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