The effects of temperature and electron-phonon coupling strength on vibrational frequency, effective confinement length, ground state energy and ground state binding energy of strong-couping polaron in a parabolic quantum wire were investigated by using linear combination operator and unitary transformation methods. It’s found that vibrational frequency, ground state energy and ground state binding energy of the strong-coupling polaron increase with the increasing of temperature. The effective confinement length increases with the increasing of temperature and electron-phonon coupling strength. But when temperature reaches a certain level, with increasing of temperature, the electron-phonon coupling strength will decrease.