The PRV gB-antibody value from 177 serum samples were detected using the approach of ELISA and the PRV neutralizing antibody titer in the same samples were measured through neutralization test to discuss their correlationship. The result from biostatistics showed that the correlation coefficient between mean S/P value of gB-antibody and neutralizing antibody titer in negative serum of gE-antibody was 0.926, which indicated that S/P value of gB-antibody and neutralizing antibody titer in immune serums have a good correlation. Generally speaking, neutralizing antibody titer had a positive correlation with protective immunity, which showed that S/P value of gB-antibody could act as an index to evaluate the porcine protective immunity for the current epidemic PRV.