  We report a sensitive study of measuring $b\to s\gamma$ photon polarisation
in $D^{0}\to K_1(1270)^-e^+\nu_e$ with an integrated luminosity of $\mathcal L$
= 1 ab$^{-1}$ at a center-of-mass energy of 3.773 GeV at future Super Tau Charm
Facility. More than 61,000 signals of $D^{0}\to K_1(1270)^-e^+\nu_e$ are
expected. Based on a fast simulation software package, the statistical
sensitivity for the ratio of up-down asymmetry is estimated to be $1.5\times
10^{-2}$ by performing a two-dimensional angular analysis in $D^{0}\to
K_1(1270)^-e^+\nu_e$. Combining with measurements of up-down asymmetry in $B\to
K_1\gamma$, the photon polarisation in $b\to s\gamma$ can be determined
model-independently.
