  In this work, we study the thermal fluctuation, deflection angle and greybody
factor of the high-dimensional Schwarzschild black hole in scalar-tensor-vector
gravity (STVG). Based on the correction of black hole entropy due to thermal
fluctuation, we calculate some thermodynamic quantities associated with the
correction of black hole entropy. The influence of the first-order and
second-order corrections, spacetime dimensionality and STVG parameters on these
thermodynamics quantities are discussed in detail. Additionally, by utilizing
the Gauss-Bonnet theorem, the deflection angle is obtained in the weak field
limit and the effect of two parameters on the results is visualized. Finally,
we calculate the bounds on greybody factors of a massless scalar field.
