Background <p>The development of high-intensity muon sources is of great importance for numerous applications in fundamental and applied research. This paper proposes a novel High rEpetition rate Muon Source (HEMS) at the China Spallation Neutron Source (CSNS) to meet this demand.</p> Objective <p>The primary objective of the HEMS project is to design and establish a facility capable of delivering high-intensity, pulsed muon beams with a repetition rate of 100 Hz for various user experiments.</p> Methods <p>The conceptual design centers on a rapid cycling synchrotron (RCS), which accelerates proton beams from the existing CSNS Linac to 500 MeV. A key innovation involves reusing each proton bunch: After acceleration, a bunch is extracted to strike a thin graphite target for muon production, then recaptured and re-accelerated by the RCS. This process is repeated 20 times per bunch. With a 5 Hz injection rate from the Linac, a final muon production rate of 100 Hz is achieved. Comprehensive simulations were conducted to analyze proton beam energy loss and emittance growth during target interactions, as well as the overall beam stability within the RCS. The design of both surface muon and decay muon beamlines is also presented.</p> Results <p>Simulation results demonstrate that the HEMS facility can generate pulsed surface and decay muon beams with intensities exceeding 10⁶ μ/s, utilizing a proton beam power of 1.125 kW. The design ensures beam stability after multiple target passages.</p> Conclusion <p>The proposed HEMS concept offers a promising approach to creating a high-repetition-rate, high-intensity muon source. This paper details the overall design, target station, and muon beamlines, establishing the feasibility of the project for future implementation.</p>