Please advice how far from Tainjin Port to PEK (Capital Airport)How much by Taxij and Bus or Train

There is about 175km between the two places and it is hard to tell the taxi fare between them. Seldom will choose taxi to reach PEK from Tianjin Port.
From that port, you can take a taxi to reach Citizen Square where you can find the Tianjin Light Rail to reach TJ Railway Station. At Railway Station, you can find the intercity trains to reach BJ South Railway Station. Get out of the station, you can find the airport shuttle bus to reach PEK directly.