  Based on 2-minute cadence TESS data, we investigate pulsations of TIC
65138566 and TIC 139729335 and discover them to be two new HADS stars with
equally spaced g modes. We recognize the radial fundamental mode $f_1$ =
18.3334 c/d and the first overtone $f_3$ = 23.6429 c/d for TIC 65138566, and
identify the highest peak $f_1$ = 19.0955 c/d as the radial fundamental mode
for TIC 139729335. For g modes, both stars display a regular period spacing of
2413 s. Through detailed seismological analysis, we deduce that these period
spacing patterns correspond to modes with $\ell$ = 1. Moreover, our analysis
reveals that with the increase in masses and metallicities, the star should
display a higher degree of evolution to match a specific period spacing
$\Pi_0$. Conversely, the star should have a lower extent of evolution to match
the radial fundamental mode. These two contradictory behaviors allow us to
precisely obtain stellar physical parameters. TIC 65138566 and TIC 139729335
are determined to be two main sequence stars that have almost the same range of
masses and metallicities, with $M$ = 1.36 $\pm$ 0.06 $M_{\odot}$ and $Z$ =
0.005 $\pm$ 0.002. The hydrogen abundance in the core of TIC 65138566 is
estimated to be about 0.28, while TIC 139729335 has a slightly higher value of
around 0.31. Finally, we suggest that the HADS $\delta$ Scuti-$\gamma$ Doradus
star TIC 308396022 is a main sequence star with $M$ = 1.54 $\pm$ 0.08
$M_{\odot}$, $Z$ = 0.007 $\pm$ 0.001, and $X_{\rm c}$ = 0.18 $\pm$ 0.02.
