The analytical express of thermal concurrence is obtained by studying one dimension two-qubit XXZ model with magnetic field. It shows that concurrence has different behaviors as anisotropy parameters vary at certain temperature,and entanglement of the system is sensitive to the variety of anisotropy parameter of external magnetic field. When anisotropy parameter(Δ)is fixed,the concurrence is symmetrically distributed in the magnetic field. When the anisotropy parameter(Δ)is increasing,the concurrence tends to zero quickly. Meanwhile the variety of temperature has some effects on entanglement. As the temperature increases,the peak value of system entanglement reduces unceasingly,and the entanglement will completely vanish.