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A time‐resolved and two‐dimensional (2D) measurement system for high‐temperature plasma based on spectroscopy and computed tomography has been developed. The projections of plasma emission were collected using a ten‐channel fiber optic in the form of fan beam. A visible grating monochromator was employed as a narrow bandpass filter to extract a specific wavelength component from the collected light signals. The wavelength was tunable over visible and ultraviolet regions. The first result of an experiment to measure a 2D profile of a field‐reversed configuration plasma is presented. The measurement wavelength (497.6 nm) was appropriate to the detection of bremsstrahlung. The reconstruction results had a spacial resolution of 15×15 and a time resolution of up to 0.5 μs. Although a plasma rotation was assigned in this experiment, the result shows the potential of the developed system for plasma diagnostics.