In this paper we report the Fermi Large Area Telescope ( Fermi -LAT ) detection of the \gamma -ray emission toward the young star forming region W43 .
Using the latest source catalog and diffuse background models , the extended \gamma -ray excess is detected with a significance of \sim 16 \sigma .
The \gamma -ray emission has a spectrum with a photon index of 2.3 \pm 0.1 .
We also performed a detailed analysis of the gas content in this region by taking into account the opacity correction to the HI gas column density .
The total cosmic-ray ( CR ) proton energy is estimated to be on the order of 10 ^ { 48 } erg, assuming the \gamma -rays are produced from the interaction of the accelerated protons and nuclei with the ambient gas .
Comparing this region to the other star formation regions in our Galaxy , we find that the CR luminosity is better correlated with the wind power than the star formation rate ( SFR ) .
This result suggests that CRs are primarily accelerated by stellar wind in these systems .