Temporal and spatial profiles of the x‐ray spectra in the range 3–400 keV have been measured for divertor plasmas on the JFT‐2M tokamak with a recently developed pulse‐height analyzer system. This detection system incorporates an array of six vertically placed sets of a high‐purity germanium spectrometer. Each x‐ray energy spectrum can be measured simultaneously with a sampling interval of 1–255 ms. Dynamic change of the electron temperature profile, such as time behavior with H‐mode transition, can be measured with this system. It was observed that the electron temperature profile became broad just after the H‐mode transition during neutral‐beam heated discharge. In the lower‐hybrid current drive experiments, the x‐ray emission profile depended strongly on the density. The x‐ray intensity from the peripheral region became strong with increase in electron density.