We prove the existence and uniqueness of global strong solution to the
free boundary problem in one dimensional compressible Navier-Stokes
system for the viscous and heat conducting ideal polytropic gas flow,
when the viscosity and heat conductivity depend on temperature in power
law of Chapman-Enskog and the data is in the neighborhood of some
background solution at initial time. We also study the large time
behavior of the solution and obtain its decay property.