Primordial black holes (PBHs) as a dark matter (DM) candidate become popular again recently.
Through their Hawking radiation, we can analyze their signal by $\gamma$-ray emissions. Our work
focuses on cross-correlating the MeV $\gamma$-ray emissions and the cosmic microwave background
shear to projectedly constrain the fraction of PBHs as DM. Near-future data can provide a tight constraint
on the fraction of the Schwarzschild PBHs in the mass range around $10^{17}$ g, like CMB-S4
project and the $\gamma$-ray telescope e-ASTROGAM. Some astrophysical sources also contributed to
the observed emission in the MeV energy band. Furthermore, the constraining ability can be
improved by another order of magnitude when taking the PBHs model with spins into account.
This technology with proper coming data could importantly fill the gaps with PBHs fraction limits
in the asteroid mass range.