Abstract: The experiments were performed to determine the profile of electron temperature in Mg/Al dotted target irradiated by laser beams at wavelength of 0.35μm from the “Xing Guang Ⅱ” laser facility. X-ray spectra from the target were measured by a spatially resolved crystal spectrometer. The technique of multi-configuration Dirac-Fock was used to calculate relevant atomic parameters. Variations of relative intensity of isoelectronic lines from the double tracing materials in laser-produced plasmas with electron temperature were derived according to local-thermodynamic-equilibrium model. And, the spatial character of electron temperature in plasmas was determined via isoelectronic spectral line intensity ratios.