A hybrid HVDC transmission system combines the advantages of LCC-HVDC and MMC-HVDC, and their adoption is an inevitable trend in the development of HVDC systems. Existing DC differential protection is susceptible to the influence of line distributed capacitance, and pilot protection depends on the boundary conditions. This has poor applicability in hybrid HVDC transmission systems. In response to the above problems, a hybrid HVDC line pilot protection method based on Empirical Mode Decomposition (EMD) and Spearman correlation coefficient is proposed. To analyze the polarity characteristics of the fault current increment and considering the effect of distributed capacitance, first, the fault current signals at both ends of the line are mirror-extended, and the residual function representing the direction of current change is extracted by EMD. Then the Spearman correlation coefficients of residual functions are calculated to identify the internal and external faults of the line. This method is not affected by distributed capacitance and does not depend on boundary conditions. Simulation results show that the proposed protection has fast operation, high reliability, and a strong ability to withstand transition resistance and noise interference. This work is supported by the National Natural Science Foundation of China-State Grid Joint Fund for Smart Grid (No. U2066210).