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We present a spectral analysis of \textit{Insight}-HXMT observations of thelow-mass X-ray binary 4U 1543-47 which locates in our Milky Way galaxy duringthe 2021 outburst. We focus on the observations in its soft state, and attemptto determine the spin of the black hole candidate through Thermal-ContinuumFitting (CF) method. The spin derived from CF method is highly dependent onblack hole mass, distance and inclination angle of inner disk. In this article,we have adopted the preferred range of parameters: $M=9.4\pm 1 M_{\odot}$,D=$7.5{\pm}0.5$ kpc and $i=36.3^{+5.3}_{-3.4}$ degrees. We attain a moderatespin, $a=0.46\pm0.12$, which is consistent with previous results measured inthe 2002 outburst. Besides, we notice the spectra show a wide blue shiftedabsorption feature between 8-10 keV which would originate from the highlyionized iron line. We try to fit the feature with {\em xstar} model and suggestthat this feature may come from relativistic disk wind with a velocity of$v_{\rm wind}\sim 0.2c$. We attribute this relativistic disk wind to thesuper-Eddington accretion during the black hole outburst.

The spin of a stellar black hole 4U 1543-47 determined by Insight-HXMT