diff --git a/.gitignore b/.gitignore
index 8eee35c73afa647728ea7d5122fcc362454bb120..378cc88c9cc708fd797c97a91ca59f0d57bd570a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .env
 .DS_Store
 ._.DS_Store
+*.mo
diff --git a/source/api_reference/average.rst b/source/api_reference/average.rst
new file mode 100644
index 0000000000000000000000000000000000000000..496f5b29875443f0c44f50fcb3ca837f4e7bcd12
--- /dev/null
+++ b/source/api_reference/average.rst
@@ -0,0 +1,16 @@
+..  THIS FILE IS GENERATED BY `gen_doc.{py|sh}`
+    !DO NOT EDIT THIS FILE MANUALLY!
+
+=============
+fluid.average
+=============
+
+.. _api_fluid_average_WeightedAverage:
+
+WeightedAverage
+---------------
+
+..  autoclass:: paddle.fluid.average.WeightedAverage
+    :members:
+    :noindex:
+
diff --git a/source/api_reference/backward.rst b/source/api_reference/backward.rst
new file mode 100644
index 0000000000000000000000000000000000000000..115e0d24b39928cfc349f72e0a21d6374cd8cd75
--- /dev/null
+++ b/source/api_reference/backward.rst
@@ -0,0 +1,23 @@
+..  THIS FILE IS GENERATED BY `gen_doc.{py|sh}`
+    !DO NOT EDIT THIS FILE MANUALLY!
+
+==============
+fluid.backward
+==============
+
+.. _api_fluid_backward_append_backward:
+
+append_backward
+---------------
+
+..  autofunction:: paddle.fluid.backward.append_backward
+    :noindex:
+
+.. _api_fluid_backward_calc_gradient:
+
+calc_gradient
+-------------
+
+..  autofunction:: paddle.fluid.backward.calc_gradient
+    :noindex:
+
diff --git a/source/api_reference/fluid.rst b/source/api_reference/fluid.rst
index 4312737ee19441ffa25413f3c8397ada5fcebb3a..163ddb13a661cce928d74d3c2d409b861d040d48 100644
--- a/source/api_reference/fluid.rst
+++ b/source/api_reference/fluid.rst
@@ -65,6 +65,22 @@ program_guard
 ..  autofunction:: paddle.fluid.program_guard
     :noindex:
 
+.. _api_fluid_switch_startup_program:
+
+switch_startup_program
+----------------------
+
+..  autofunction:: paddle.fluid.switch_startup_program
+    :noindex:
+
+.. _api_fluid_switch_main_program:
+
+switch_main_program
+-------------------
+
+..  autofunction:: paddle.fluid.switch_main_program
+    :noindex:
+
 .. _api_fluid_get_var:
 
 get_var
@@ -358,12 +374,3 @@ DataFeeder
     :members:
     :noindex:
 
-.. _api_fluid_Scope:
-
-Scope
------
-
-..  autoclass:: paddle.fluid.Scope
-    :members:
-    :noindex:
-
diff --git a/source/api_reference/gen_doc.sh b/source/api_reference/gen_doc.sh
index bdc98afd9e1d5a7ccf9772d6c8cec68ff0193a3c..88f0fed33322e0b270d6b236472544a88b7205c3 100755
--- a/source/api_reference/gen_doc.sh
+++ b/source/api_reference/gen_doc.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 python gen_doc.py layers --submodules control_flow device io nn ops tensor learning_rate_scheduler detection metric tensor > layers.rst
 
-for module in data_feeder clip metrics executor initializer io nets optimizer param_attr profiler regularizer transpiler recordio_writer
+for module in data_feeder clip metrics executor initializer io nets optimizer param_attr profiler regularizer transpiler recordio_writer backward average
 do
   python gen_doc.py ${module} > ${module}.rst
 done
diff --git a/source/api_reference/layers.rst b/source/api_reference/layers.rst
index c62947bbf8586e34186fcdb7a53e9d6cc4b1f932..7c7bd56eadb3f9bb87adac051b2694a8d6d74655 100644
--- a/source/api_reference/layers.rst
+++ b/source/api_reference/layers.rst
@@ -910,6 +910,14 @@ log
 ..  autofunction:: paddle.fluid.layers.log
     :noindex:
 
+.. _api_fluid_layers_crop:
+
+crop
+----
+
+..  autofunction:: paddle.fluid.layers.crop
+    :noindex:
+
 ops
 ===
 
diff --git a/source/api_reference/optimizer.rst b/source/api_reference/optimizer.rst
index 15a764d8e7b52c4a43508d838deb7057f5ff9ca2..a3bab24ce010d6b768e37b40783ea27037e62682 100644
--- a/source/api_reference/optimizer.rst
+++ b/source/api_reference/optimizer.rst
@@ -59,6 +59,15 @@ DecayedAdagrad
     :members:
     :noindex:
 
+.. _api_fluid_optimizer_Ftrl:
+
+Ftrl
+----
+
+..  autoclass:: paddle.fluid.optimizer.Ftrl
+    :members:
+    :noindex:
+
 .. _api_fluid_optimizer_SGDOptimizer:
 
 SGDOptimizer
@@ -122,6 +131,15 @@ RMSPropOptimizer
     :members:
     :noindex:
 
+.. _api_fluid_optimizer_FtrlOptimizer:
+
+FtrlOptimizer
+-------------
+
+..  autoclass:: paddle.fluid.optimizer.FtrlOptimizer
+    :members:
+    :noindex:
+
 .. _api_fluid_optimizer_Adadelta:
 
 Adadelta
diff --git a/source/locale/en/LC_MESSAGES/index.po b/source/locale/en/LC_MESSAGES/index.po
index 03fa1eb722751146c80a91521fdfb88a5a50d8bf..06ace94f6a47defdf53ae107c730b8ba62a0998f 100644
--- a/source/locale/en/LC_MESSAGES/index.po
+++ b/source/locale/en/LC_MESSAGES/index.po
@@ -4,23 +4,24 @@
 # package.
 # FIRST AUTHOR <EMAIL@ADDRESS>, 2018.
 #
-#, fuzzy
 msgid ""
 msgstr ""
 "Project-Id-Version: PaddlePaddle Fluid 0.13.0\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2018-06-14 18:52+0800\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
-"Language-Team: LANGUAGE <LL@li.org>\n"
+"PO-Revision-Date: 2018-06-19 16:12+0800\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Generated-By: Babel 2.6.0\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"Language: en\n"
+"X-Generator: Poedit 2.0.8\n"
 
 #: ../../source/index.rst:8
 msgid "欢迎来到 Fluid"
-msgstr ""
+msgstr "Welcome to Fluid documentation"
 
 #: ../../source/index.rst:25
 msgid "Indices and tables"
@@ -37,4 +38,3 @@ msgstr ""
 #: ../../source/index.rst:29
 msgid ":ref:`search`"
 msgstr ""
-