  With the observed data of the S2 orbit around the black hole Sgr A$^*$ and
the Markov Chain Monte Carlo method, we make a constraint on parameters of a
disformal Schwarzschild black hole in quadratic degenerate higher-order
scalar-tensor (DHOST) theories. This black hole belongs to a class of
non-stealth solutions and owns an extra disformal parameter described the
deviation from general relativity. Our results show that the best fit value of
the disformal parameter is positive. However, in the range of $1\sigma$, we
also find that general relativity remains to be consistent with the observation
of the S2 orbit.
