> I want to know what's meaning of 'S','.','P','F'? 

You should learn a bit about TCP protocol.

S is for SYN (synchronize)
P is for PUSH
F is for FIN
. is for nothing

Pakets are:

3 way hand shake initiate TCP connection
client > server SYN
sever > client SYN ACK
client > server ACK

client > server send data
server > client ACK and send data
client > server ACK

client > server FIN
server > client ACK
server > cient FIN
client > server ACK

ACk means acknowledge.

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