In recent years，silicon-based multi-pixel photon counters (MPPCs)，which possess single-photon sensitivity and the ability to resolve pulse photon numbers at room temperature，have been increasingly applied in various fields.However，the bandgap of silicon limits the detectable photon wavelength to a maximum of 1100 nm，and no MPPCs capable of detecting photons beyond 1100 nm have been mass-produced to date.To enable MPPCs to detect photons in the near-infrared (NIR) region，this study proposes the use of upconversion fluorescent particles.By uniformly doping a suitable concentration of upconversion particles into the transparent encapsulating resin covering the photosensitive surface of the MPPC，incident NIR light is converted into visible light through the upconversion effect，thereby allowing the MPPC to respond indirectly to NIR photons.Experimental results show that under illumination at 1310 nm and 1550 nm，the sensitivity of MPPCs covered with the fluorescent-doped resin increases by up to 29.77 times and 8.98 times，respectively.These results demonstrate that the use of upconversion fluorescent particles can significantly enhance the NIR sensitivity of MPPCs，showing potential for applications in near-infrared single-photon detection.