【摘要】：In this work, we study the response of a single layer Thick Gaseous Electron Multiplier(THGEM)detector to p/π+at the E3 line of the Beijing Test Beam Facility. The THGEM detector drift gap used in this study is 4 mm, and the gain of the detector operated in Ar+3% i C4 H10 is about 2000. p/π+particles at momenta between500 Me V/c and 1000 Me V/c are distinguished by a Time Of Flight system. Our results show that at the measured momenta, detection efficiencies for p are from 93% to 99%, and for π+in the range of 82%–88%. Meanwhile, simple Geant4 simulations also have been done, and are consistent with the amplitude spectra of the beam test results. We preliminarily study the feasibility of the THGEM detector as a sampling element for a Digital Hadronic Calorimeter(DHCAL), which may provide support for the possible application of a THGEM detector in the Circular Electron Positron Collider(CEPC) HCAL.