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Two high performance silicon drift detectors(SDD)are installed at the equatorial port with z=0 and z=-16.4cm on HL-2A tokamak,respectively.These SDDs combine with the new and non-conventional software pulse height analyser(SPHA)successfully developed more recently by us to measure the time evolution of soft x-rays spectra,the thermal and superthermal electron temperatures.The high-quality three-dimensional figure of time evolution for soft x-rays energy spectra is easily obtained by combination of a new SPHA and computer.