The ESR spectra of BaCl2: Eu powder showed that Eu2+ ion substituting the ion Ba2+ is situated in a crystal field of the orthorhcmbic symmetry. By fitting the ESR experimental data to the axial symmetric spin Hamiltonian and the crystal field Hamiltonian, the spin Hamiltonian parameters were obtained. In addition, based on variation of ESR peak-hight versus doping concentration of Eu, the doping value Cs for saturated substitution of Eu2+ was found to be 0.34 mol%.