Hi @Sunchanglei!
@hogrefe.christian is correct that you should have the fractional land use after running MCIP in the file LUFRAC_CRO. However, you need to ensure that you provided the fractional land use information from WRF to MCIP in order to make those data available for CMAQ.
There are two pathways to provide the fractional land use data from WRF to MCIP: via the WRF output or via the output from Geogrid, which defines the simulation domain for WRF. The fractional land use data are not written to WRF output (wrfout) by default, so you would need to intentionally request (through the WRF Registry) that those data are written. If you (or whoever ran WRF) modified the Registry to include fractional land use (LANDUSEF) data in the wrfout files, then the data would be there and would be processed by MCIP. If WRF was run without writing LANDUSEF to wrfout, then instead you can provide the WRF Preprocessing System (WPS) Geogrid output (geo_em) file to MCIP via the script (and toggle the switch in the script to read that file), and MCIP can pull those data from there.
If you need to rerun MCIP to create the LUFRAC_CRO file, you only need to rerun one time step (not the full length of your WRF simulation) because the fractional land use does not change over time.
Hope this helps!
–Tanya