Dear @Baoxuan.Wang,
The local span outputs at the pitch axis for the NREL 5-MW baseline wind turbine blade lie between 0.5chord and 0.375chord.
In the ElastoDyn blade input file, there is only a single input PitchAxis, and AeroRef is not entered. Instead, AeroRef is defaulted to 0.25 internally within ElastoDyn, thus: AeroCent = 0.5 - PitchAxis. So the PitchAxis input to ElastoDyn should be interpreted a bit differently than the PitchAxis column explained in NREL 5MW Rotor Geometry.
But please note that the PitchAxis input to ElastoDyn is only used by the older AeroDyn v14, which will soon be depracated. When that happens, the PitchAxis input will be removed from ElastoDyn altogether as it will not longer be needed. When AeroDyn v15 is used, the aerodynamic center is specified relative to the pitch axis via AeroDyn v15 inputs BlCrvAC and BlSwpAC.
I hope that helps.
Best regards,