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AT2019wey is a new galactic X-ray binary that was first discovered as anoptical transient by the Australia Telescope Large Area Survey (ATLAS) onDecember 7, 2019. AT2019wey consists of a black hole candidate as well as alow-mass companion star ($M_{\text {star }} \lesssim 0.8 M_{\odot}$) and islikely to have a short orbital period ($P_{\text {orb }} \lesssim 8$ h).Although AT2019wey began activation in the X-ray band during almost the entireoutburst on March 8, 2020, it did not enter the soft state during the entireoutburst. In this study, we present a detailed spectral analysis of AT2019weyin the low/hard state during its X-ray outburst on the basis of NuclearSpectroscopic Telescope Array \emph observations. We obtain tight constraintson several of its important physical parameters by applying the State-of-art\texttt{relxill} relativistic reflection model family. In particular, wedetermine that the measured inner radius of the accretion disk is most likelyto have extended to the innermost stable circular orbit (ISCO) radius, i.e.,$R_{\text{in}}=1.38^{+0.23}_{-0.16}~R_{\text{ISCO}}$. Hence, assuming$R_{\text{in}}$=$R_{\text{ISCO}}$, we find the spin of AT2019wey to be$a_{*}\sim$ $0.97$, which is close to the extreme and an inner disk inclinationangle of ~$i\sim$ $22 ^{\circ}$. Additionally, according to our adopted models,AT2019wey tends to have a relatively high iron abundance of$A_{\mathrm{Fe}}\sim$ 5 $A_{\mathrm{Fe}, \odot}$ and a high disk ionizationstate of $\log \xi\sim$ 3.4.

Spectral Analysis of New Black Hole Candidate AT2019wey Observed by NuSTAR