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The proton-proton ($pp$) fusion chain dominates the neutrino production fromthe Sun. The uncertainty of the predicted $pp$ neutrino flux is at thesub-percent level, whereas that of the best measurement is $\mathcal{O}(10\%)$.In this paper, we present the first result to measure the solar $pp$ neutrinosin the electron recoil energy range from 24 to 144 keV, using the PandaX-4Tcommissioning data with 0.63 tonne$\times$year exposure. The $pp$ neutrino fluxis determined to be $(8.0 \pm 3.9 \,{\rm{(stat)}} \pm 10.0 \,{\rm{(syst)}})\times 10^{10}\, $$\rm{s}^{-1} \rm{cm}^{-2}$, consistent with Standard SolarModel and existing measurements, corresponding to a flux upper limit of$23.3\times 10^{10}\, $$\rm{s}^{-1} \rm{cm}^{-2}$ at 90\% C.L..

Measurement of Solar $pp$ Neutrino Flux using Electron Recoil Data from PandaX-4T Commissioning Run