diff --git a/util/gdas_init/config b/util/gdas_init/config
index a67f75c35..5bfe25a81 100644
--- a/util/gdas_init/config
+++ b/util/gdas_init/config
@@ -44,6 +44,10 @@
 #                or incomplete. So this option may not
 #                always work. Contact george.gayno@noaa.gov
 #                if you encounter problems.
+# FRAC_ORO     - To use the latest orographic data, 
+#                set to 'yes', otherwise, set to 'no'.
+#                Note that: the latest orographic data
+#                support both frac_grid and none frac_grid in the UFS 
 #
 #-----------------------------------------------------------
 
@@ -63,6 +67,8 @@ LEVS=65
 
 CDUMP=gdas
 
+FRAC_ORO=yes
+
 CRES_HIRES=C192
 CRES_ENKF=C96
 
@@ -73,7 +79,6 @@ OUTDIR=/lfs/h2/emc/stmp/$USER/gdas.init/output
 #---------------------------------------------------------
 # Dont touch anything below here.
 #---------------------------------------------------------
-
 if [ "$use_v16retro" = "yes" ]; then
 
   gfs_ver=v16retro
@@ -107,5 +112,5 @@ else
 
 fi
 
-export EXTRACT_DIR yy mm dd hh UFS_DIR OUTDIR CRES_HIRES CRES_ENKF
+export EXTRACT_DIR yy mm dd hh UFS_DIR OUTDIR CRES_HIRES CRES_ENKF FRAC_ORO
 export LEVS gfs_ver
diff --git a/util/gdas_init/run_pre-v14.chgres.sh b/util/gdas_init/run_pre-v14.chgres.sh
index 3d7ebd9d3..f59ee675a 100755
--- a/util/gdas_init/run_pre-v14.chgres.sh
+++ b/util/gdas_init/run_pre-v14.chgres.sh
@@ -44,13 +44,15 @@ rm -fr $OUTDIR
 mkdir -p $OUTDIR
 mkdir -p $OUTDIR/INPUT
 
+source $UFS_DIR/util/gdas_init/set_fixed_files.sh
+
 cat << EOF > fort.41
 
 &config
- fix_dir_target_grid="${FIX_ORO}/${CTAR}/fix_sfc"
- mosaic_file_target_grid="${FIX_ORO}/${CTAR}/${CTAR}_mosaic.nc"
- orog_dir_target_grid="${FIX_ORO}/${CTAR}"
- orog_files_target_grid="${CTAR}_oro_data.tile1.nc","${CTAR}_oro_data.tile2.nc","${CTAR}_oro_data.tile3.nc","${CTAR}_oro_data.tile4.nc","${CTAR}_oro_data.tile5.nc","${CTAR}_oro_data.tile6.nc"
+ fix_dir_target_grid="${FIX_ORO}/${ORO_DIR}/fix_sfc"
+ mosaic_file_target_grid="${FIX_ORO}/${ORO_DIR}/${CTAR}_mosaic.nc"
+ orog_dir_target_grid="${FIX_ORO}/${ORO_DIR}"
+ orog_files_target_grid="${ORO_NAME}.tile1.nc","${ORO_NAME}.tile2.nc","${ORO_NAME}.tile3.nc","${ORO_NAME}.tile4.nc","${ORO_NAME}.tile5.nc","${ORO_NAME}.tile6.nc"
  data_dir_input_grid="${INPUT_DATA_DIR}"
  atm_files_input_grid="$ATMFILE"
  sfc_files_input_grid="$SFCFILE"
diff --git a/util/gdas_init/run_v14.chgres.sh b/util/gdas_init/run_v14.chgres.sh
index 6df881f8b..ac63955b0 100755
--- a/util/gdas_init/run_v14.chgres.sh
+++ b/util/gdas_init/run_v14.chgres.sh
@@ -40,13 +40,15 @@ rm -fr $OUTDIR
 mkdir -p $OUTDIR
 mkdir -p $OUTDIR/INPUT
 
+source $UFS_DIR/util/gdas_init/set_fixed_files.sh
+
 cat << EOF > fort.41
 
 &config
- fix_dir_target_grid="${FIX_ORO}/${CTAR}/fix_sfc"
- mosaic_file_target_grid="${FIX_ORO}/${CTAR}/${CTAR}_mosaic.nc"
- orog_dir_target_grid="${FIX_ORO}/${CTAR}"
- orog_files_target_grid="${CTAR}_oro_data.tile1.nc","${CTAR}_oro_data.tile2.nc","${CTAR}_oro_data.tile3.nc","${CTAR}_oro_data.tile4.nc","${CTAR}_oro_data.tile5.nc","${CTAR}_oro_data.tile6.nc"
+ fix_dir_target_grid="${FIX_ORO}/${ORO_DIR}/fix_sfc"
+ mosaic_file_target_grid="${FIX_ORO}/${ORO_DIR}/${CTAR}_mosaic.nc"
+ orog_dir_target_grid="${FIX_ORO}/${ORO_DIR}"
+ orog_files_target_grid="${ORO_NAME}.tile1.nc","${ORO_NAME}.tile2.nc","${ORO_NAME}.tile3.nc","${ORO_NAME}.tile4.nc","${ORO_NAME}.tile5.nc","${ORO_NAME}.tile6.nc"
  data_dir_input_grid="${INPUT_DATA_DIR}"
  atm_files_input_grid="$ATMFILE"
  sfc_files_input_grid="$SFCFILE"
diff --git a/util/gdas_init/run_v15.chgres.gfs.sh b/util/gdas_init/run_v15.chgres.gfs.sh
index dfc35c2f7..2c09b2f47 100755
--- a/util/gdas_init/run_v15.chgres.gfs.sh
+++ b/util/gdas_init/run_v15.chgres.gfs.sh
@@ -27,13 +27,15 @@ rm -fr $OUTDIR
 mkdir -p $OUTDIR
 mkdir -p $OUTDIR/INPUT
 
+source $UFS_DIR/util/gdas_init/set_fixed_files.sh
+
 cat << EOF > fort.41
 
 &config
- fix_dir_target_grid="${FIX_ORO}/${CTAR}/fix_sfc"
- mosaic_file_target_grid="${FIX_ORO}/${CTAR}/${CTAR}_mosaic.nc"
- orog_dir_target_grid="${FIX_ORO}/${CTAR}"
- orog_files_target_grid="${CTAR}_oro_data.tile1.nc","${CTAR}_oro_data.tile2.nc","${CTAR}_oro_data.tile3.nc","${CTAR}_oro_data.tile4.nc","${CTAR}_oro_data.tile5.nc","${CTAR}_oro_data.tile6.nc"
+ fix_dir_target_grid="${FIX_ORO}/${ORO_DIR}/fix_sfc"
+ mosaic_file_target_grid="${FIX_ORO}/${ORO_DIR}/${CTAR}_mosaic.nc"
+ orog_dir_target_grid="${FIX_ORO}/${ORO_DIR}"
+ orog_files_target_grid="${ORO_NAME}.tile1.nc","${ORO_NAME}.tile2.nc","${ORO_NAME}.tile3.nc","${ORO_NAME}.tile4.nc","${ORO_NAME}.tile5.nc","${ORO_NAME}.tile6.nc"
  data_dir_input_grid="${INPUT_DATA_DIR}"
  atm_files_input_grid="$ATMFILE"
  sfc_files_input_grid="$SFCFILE"
diff --git a/util/gdas_init/run_v15.chgres.sh b/util/gdas_init/run_v15.chgres.sh
index 5d59fadc9..b78024538 100755
--- a/util/gdas_init/run_v15.chgres.sh
+++ b/util/gdas_init/run_v15.chgres.sh
@@ -44,13 +44,15 @@ rm -fr $OUTDIR
 mkdir -p $OUTDIR
 mkdir -p $OUTDIR/INPUT
 
+source $UFS_DIR/util/gdas_init/set_fixed_files.sh
+
 cat << EOF > fort.41
 
 &config
- fix_dir_target_grid="${FIX_ORO}/${CTAR}/fix_sfc"
- mosaic_file_target_grid="${FIX_ORO}/${CTAR}/${CTAR}_mosaic.nc"
- orog_dir_target_grid="${FIX_ORO}/${CTAR}"
- orog_files_target_grid="${CTAR}_oro_data.tile1.nc","${CTAR}_oro_data.tile2.nc","${CTAR}_oro_data.tile3.nc","${CTAR}_oro_data.tile4.nc","${CTAR}_oro_data.tile5.nc","${CTAR}_oro_data.tile6.nc"
+ fix_dir_target_grid="${FIX_ORO}/${ORO_DIR}/fix_sfc"
+ mosaic_file_target_grid="${FIX_ORO}/${ORO_DIR}/${CTAR}_mosaic.nc"
+ orog_dir_target_grid="${FIX_ORO}/${ORO_DIR}"
+ orog_files_target_grid="${ORO_NAME}.tile1.nc","${ORO_NAME}.tile2.nc","${ORO_NAME}.tile3.nc","${ORO_NAME}.tile4.nc","${ORO_NAME}.tile5.nc","${ORO_NAME}.tile6.nc"
  mosaic_file_input_grid="${FIX_ORO}/${CINP}/${CINP}_mosaic.nc"
  orog_dir_input_grid="${FIX_ORO}/${CINP}"
  orog_files_input_grid="${CINP}_oro_data.tile1.nc","${CINP}_oro_data.tile2.nc","${CINP}_oro_data.tile3.nc","${CINP}_oro_data.tile4.nc","${CINP}_oro_data.tile5.nc","${CINP}_oro_data.tile6.nc"
diff --git a/util/gdas_init/run_v16.chgres.sh b/util/gdas_init/run_v16.chgres.sh
index d359b0361..3583fd85c 100755
--- a/util/gdas_init/run_v16.chgres.sh
+++ b/util/gdas_init/run_v16.chgres.sh
@@ -59,13 +59,15 @@ rm -fr $WORKDIR
 mkdir -p $WORKDIR
 cd $WORKDIR
 
+source $UFS_DIR/util/gdas_init/set_fixed_files.sh
+
 cat << EOF > fort.41
 
 &config
- fix_dir_target_grid="${FIX_ORO}/${CTAR}/fix_sfc"
- mosaic_file_target_grid="${FIX_ORO}/${CTAR}/${CTAR}_mosaic.nc"
- orog_dir_target_grid="${FIX_ORO}/${CTAR}"
- orog_files_target_grid="${CTAR}_oro_data.tile1.nc","${CTAR}_oro_data.tile2.nc","${CTAR}_oro_data.tile3.nc","${CTAR}_oro_data.tile4.nc","${CTAR}_oro_data.tile5.nc","${CTAR}_oro_data.tile6.nc"
+ fix_dir_target_grid="${FIX_ORO}/${ORO_DIR}/fix_sfc"
+ mosaic_file_target_grid="${FIX_ORO}/${ORO_DIR}/${CTAR}_mosaic.nc"
+ orog_dir_target_grid="${FIX_ORO}/${ORO_DIR}"
+ orog_files_target_grid="${ORO_NAME}.tile1.nc","${ORO_NAME}.tile2.nc","${ORO_NAME}.tile3.nc","${ORO_NAME}.tile4.nc","${ORO_NAME}.tile5.nc","${ORO_NAME}.tile6.nc"
  data_dir_input_grid="${INPUT_DATA_DIR}"
  atm_files_input_grid="${ATMFILE}"
  sfc_files_input_grid="${SFCFILE}"
diff --git a/util/gdas_init/run_v16retro.chgres.sh b/util/gdas_init/run_v16retro.chgres.sh
index d8b49c796..15b72b409 100755
--- a/util/gdas_init/run_v16retro.chgres.sh
+++ b/util/gdas_init/run_v16retro.chgres.sh
@@ -69,13 +69,15 @@ rm -fr $WORKDIR
 mkdir -p $WORKDIR
 cd $WORKDIR
 
+source $UFS_DIR/util/gdas_init/set_fixed_files.sh
+
 cat << EOF > fort.41
 
 &config
- fix_dir_target_grid="${FIX_ORO}/${CTAR}/fix_sfc"
- mosaic_file_target_grid="${FIX_ORO}/${CTAR}/${CTAR}_mosaic.nc"
- orog_dir_target_grid="${FIX_ORO}/${CTAR}"
- orog_files_target_grid="${CTAR}_oro_data.tile1.nc","${CTAR}_oro_data.tile2.nc","${CTAR}_oro_data.tile3.nc","${CTAR}_oro_data.tile4.nc","${CTAR}_oro_data.tile5.nc","${CTAR}_oro_data.tile6.nc"
+ fix_dir_target_grid="${FIX_ORO}/${ORO_DIR}/fix_sfc"
+ mosaic_file_target_grid="${FIX_ORO}/${ORO_DIR}/${CTAR}_mosaic.nc"
+ orog_dir_target_grid="${FIX_ORO}/${ORO_DIR}"
+ orog_files_target_grid="${ORO_NAME}.tile1.nc","${ORO_NAME}.tile2.nc","${ORO_NAME}.tile3.nc","${ORO_NAME}.tile4.nc","${ORO_NAME}.tile5.nc","${ORO_NAME}.tile6.nc"
  mosaic_file_input_grid="${FIX_ORO}/${CINP}/${CINP}_mosaic.nc"
  orog_dir_input_grid="${FIX_ORO}/${CINP}"
  orog_files_input_grid="${CINP}_oro_data.tile1.nc","${CINP}_oro_data.tile2.nc","${CINP}_oro_data.tile3.nc","${CINP}_oro_data.tile4.nc","${CINP}_oro_data.tile5.nc","${CINP}_oro_data.tile6.nc"
diff --git a/util/gdas_init/set_fixed_files.sh b/util/gdas_init/set_fixed_files.sh
new file mode 100755
index 000000000..c81d99816
--- /dev/null
+++ b/util/gdas_init/set_fixed_files.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+#---------------------------------------------------------------------------
+# Set directory names and file names for orog data
+# The old and new (support fractional grid) orog data have different file names
+#---------------------------------------------------------------------------
+
+if [ "${FRAC_ORO:-"no"}" = "yes" ]; then
+  if  [ ${CTAR} == 'C48' ] ; then
+    OCNRES='500'
+  elif [ ${CTAR} == 'C96' ] ; then
+    OCNRES='100'
+  elif [ ${CTAR} == 'C192' ] ; then
+    OCNRES='050'
+  elif [ ${CTAR} == 'C384' ] || [ ${CTAR} == 'C768' ] || [ ${CTAR} == 'C1152' ]; then
+    OCNRES='025'
+  fi
+  ORO_DIR="${CTAR}.mx${OCNRES}_frac"
+  ORO_NAME="oro_${CTAR}.mx${OCNRES}"
+else
+  ORO_DIR="${CTAR}"
+  ORO_NAME="${CTAR}_oro_data"
+fi