In this work, we have investigated the influence of magnetic island (MI) on electrostatic toroidal ion temperature gradient (ITG) mode, where the ions are described by gyro-kinetic equations including MI, and adiabatic approximation is used for electrons. The eigen-equation for short-wavelength toroidal ITG mode in Fourier-ballooning representation is derived, and the corresponding eigenvalue as well as mode structure are solved. Both the flattening effects of MI on plasma pressure and MI-scale shear flow are considered. It is found that when only considering the flattening effects of MI, the ITG mode can be stabilized compared to the case without MI. Meanwhile, the effective toroidal ITG mode drive can be enhanced by including MI-scale flow, which indicates the dominant destabilizing by MI-scale flow over the stabilizing by flattening profile, which results in a higher growth rate than the case without MI. It is also found that the total flow shearing may prevent the ITG turbulence spreading from the X-point of MI but is not strong enough to prevent spreading from the separatrix across the O-point of larger MI via comparison between the flow shearing rate and the linear growth rate. Furthermore, the corresponding width of the lowest-order mode structure in the ballooning angle is slightly widened (narrowed) for the case without (with) MI-scale flow, compared to the case without MI. Moreover, the shifted even symmetry in the ballooning angle is not qualitatively influenced by the presence of MI. The mode structure is radially asymmetric but is symmetric with respect to the phase of MI at the O-point.