diff --git a/code/code_gen/post.py b/code/code_gen/post.py
index 34ec7ba..1f828c0 100644
--- a/code/code_gen/post.py
+++ b/code/code_gen/post.py
@@ -251,13 +251,13 @@ class FieldExporter (object):
 
     fmt_calc='''
 ! copy to array for export
-do k = 1, nzp
-do j = 1, nyp
-do i = {}, {}
-{}(i,j,k) = {}(i,j,k)
-end do
-end do
-end do
+! do k = 1, nzp
+! do j = 1, nyp
+! do i = {}, {}
+! {}(i,j,k) = {}(i,j,k)
+! end do
+! end do
+! end do
 
 ! after calculate
 ! count = {x1-x0+1} * ny * nz
@@ -271,21 +271,21 @@ end do
         self.parent = parent
         self.x0 = attr["x0"]
         self.x1 = attr["x1"]
-        self.xslice = "{}:{},ny,nz".format(x0, x1)
+        self.xslice = "{}:{},ny,nz".format(self.x0, self.x1)
 
 
     def code (self):
         # argument time index, file id, array
-        return # real_array_loop.format((self.array, rhs), self.comment)
+        return FieldExporter.fmt_calc # real_array_loop.format((self.array, rhs), self.comment)
 
     def code_decl (self):
-        return # real_array_decl.format(self.name, self.dim)
+        return FieldExporter.fmt_decl # real_array_decl.format(self.name, self.dim)
 
     def code_alloc (self):
-        return # real_array_alloc.format(self.name, self.shape)
+        return FieldExporter.fmt_init # real_array_alloc.format(self.name, self.shape)
 
     def code_free (self):
-        return # real_array_free.format(self.name)
+        return FieldExporter.fmt_final # real_array_free.format(self.name)
 
 
 
@@ -299,12 +299,22 @@ class Field (FieldBase):
         self.fluc, self.dep, self.derivs = ExpInspector.inspect(exp)
         self.comment = ExpToCode(self.fdict).transform(self.exp)
 
+        self.exporter = None
+        try:
+            if self.attr["export"]:
+                self.exporter = FieldExporter(self.name, self.attr, self)
+        except KeyError:
+            pass
+
         '''
         for a in self.dep:
             if a not in self.fdict:
                 raise StandardError(a + " is not defined")
         '''
 
+    def export_on (self):
+        return self.exporter is not None
+
     def code (self, alloc=None):
         real_array_loop  = """
 ! {1}
@@ -319,7 +329,10 @@ end do
         self.array = alloc[self.name] if alloc else self.name
 
         rhs = ExpToCode(self.fdict).transform(self.exp)
-        return real_array_loop.format((self.array, rhs), self.comment)
+        calculation_code = real_array_loop.format((self.array, rhs), self.comment)
+        export_code = ( self.exporter.code() if self.export_on() else "")
+
+        return calculation_code + export_code
 
 
 class FluctuationField (FieldBase):
@@ -824,9 +837,9 @@ close (200)
 
         md = {}
         md["module_name"] = "terms"
-        md["module_data"] = "\n".join((declf, declh, declavg, declarr))
-        md["module_init"] = "\n".join((allocavg, allocarr))
-        md["module_finalize"] = "\n".join((freeavg, freearr))
+        md["module_data"] = "\n".join((declf, declh, declavg, decl_export, declarr))
+        md["module_init"] = "\n".join((allocavg, alloc_export, allocarr))
+        md["module_finalize"] = "\n".join((freeavg, free_export, freearr))
         md["module_pass1"]     = sub_calc1
         md["module_pass1_avg"] = sub_avg1
         md["module_pass2"]     = sub_calc2
diff --git a/code/m_terms.f90 b/code/m_terms.f90
index 77dfc5e..d5aa934 100644
--- a/code/m_terms.f90
+++ b/code/m_terms.f90
@@ -12,6 +12,14 @@ character (len = *), parameter :: output_header="x avg_c avg_divn avg_fsd"
 real*8, allocatable, dimension(:) :: avg_c
 real*8, allocatable, dimension(:) :: avg_fsd
 real*8, allocatable, dimension(:) :: avg_divn
+
+! - file_handles and mpi_infos
+! integer(kind=MPI_INTEGER_KIND) :: {field_name}_fh
+! integer(kind=MPI_INTEGER_KIND) :: {field_name}_info
+
+! - buffer
+! real*8, allocatable, dimension(:,:,:) :: {field_name}_export_array
+
 real*8, allocatable, dimension(:,:,:) :: xyzbuffer0
 real*8, allocatable, dimension(:,:,:) :: xyzbuffer1
 real*8, allocatable, dimension(:,:,:) :: xyzbuffer2
@@ -27,6 +35,12 @@ integer :: ierr
 allocate(avg_c(nxp), stat=ierr) ; avg_c = 0.
 allocate(avg_fsd(nxp), stat=ierr) ; avg_fsd = 0.
 allocate(avg_divn(nxp), stat=ierr) ; avg_divn = 0.
+
+! init
+! call MPI_INFO_CREATE({field_name}_info, mpi_err)
+! call MPI_FILE_OPEN(MPI_COMM_TASK,{field_name}_fname,MPI_MODE_WRONLY+MPI_MODE_CREATE,{field_name}_info,{field_name}_fh,mpi_err)
+! allocate({field_name}_export_array({1}), stat=ierr) ; {field_name}_export_array = 0.
+
 allocate(xyzbuffer0(nxp,nyp,nzp), stat=ierr) ; xyzbuffer0 = 0.
 allocate(xyzbuffer1(nxp,nyp,nzp), stat=ierr) ; xyzbuffer1 = 0.
 allocate(xyzbuffer2(nxp,nyp,nzp), stat=ierr) ; xyzbuffer2 = 0.
@@ -41,6 +55,12 @@ subroutine m_terms_finalize
 deallocate(avg_c)
 deallocate(avg_fsd)
 deallocate(avg_divn)
+
+! finalize
+! call MPI_FILE_CLOSE({field_name}_fh, mpi_err)
+! call MPI_INFO_FREE({field_name}_info, mpi_err)
+! deallocate({field_name}_export_array)
+
 deallocate(xyzbuffer0)
 deallocate(xyzbuffer1)
 deallocate(xyzbuffer2)
@@ -138,6 +158,20 @@ end do
 end do
 end do
 
+! copy to array for export
+! do k = 1, nzp
+! do j = 1, nyp
+! do i = {}, {}
+! {}(i,j,k) = {}(i,j,k)
+! end do
+! end do
+! end do
+
+! after calculate
+! count = {x1-x0+1} * ny * nz
+! offset = time_count * count
+! call MPI_FILE_WRITE_AT({field_name}_fh, offset, {field_name}_export_buffer, count, MPI_REAL8, mpi_status, mpi_err)
+
 
 do k = 1, nzp
 do j = 1, nyp