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An infinite-volume of atmospheric argon microwave plasma is produced in the microwave plasma source based on the inductive coupling window-reetangular resonator under the input of the microwave power at 2.45 GHz.The excitation temperature of the plasma is studied by using the Boltzmann plot of Ar Ⅰ lines in two different wavelength ranges while the electron temperature is researched by using line-to-continuum intensity ratio of Ar I lines.The electron density is compared by using the Stark broadenings of Ar I lines at 522.13nm and 549.59nm and Hβ line at 486.13nm.