To solve the problem that the early strength of traditional C30 shotcrete is low， and difficult to meet the design requirements that 8 h compressive strength is not lower than 10 MPa and 24 h compressive strength is not lower than 15 MPa for railway tunnels high performance support system， the C30 high early-strength shotcrete with good workability， high early strength and no lowering of late strength was prepared and verified in on-site tests by the analysis of raw material characteristics， ratio design， the use of nano early-strength agent and alkali-free quick-setting agent， and the synergistic influence of concrete mix temperature and curing temperature. The results show that the prepared C30 high early-strength shotcrete has good fluidity， small loss of slump over time and low rebound rate. All performance indicators can meet the design and construction requirements.