Abstract: An implantation Mo 15 N x target is applied for studying 15 N(p,α) 12 C reaction in sub coulomb barrier energy region. The differential cross section and excitation function of 15 N(p,α) 12 C reaction are measured in the energy region between 163 keV and 370 keV at θ lab =90°. The excitation curve grows rapidly from low energy and decreases slowly after the maximum. The maximum of the differential cross section is about 7.15×10 -27 cm 2·sr -1 at E c=335 keV.