Crystalline field energy levels of central ion and lingands for complex ions CuX4--(X = Cl, Br) were given. By considering the crystalline field effect, and by using the modified Wolfsberg-Helmholz 's molecular orbital approximation, the energies for the ground state and some of the excited states of these complex ions were calculated. The calculation results are in agreement with the features of the observed lingand field transition bands and electron-transfer spectra.