diff --git a/doc/tutorials/partition_desc.ini b/doc/tutorials/partition_desc.ini
index fa09bbcb5..8e6bce9cf 100755
--- a/doc/tutorials/partition_desc.ini
+++ b/doc/tutorials/partition_desc.ini
@@ -6,9 +6,14 @@
 [base]
 # The sequence matters, and the index starts from p1.
 # The fastboot ABL by default boots from the 2nd partition.
-partitions = sos_rootfs sos_boot data_partition
+partitions = data_partition sos_boot sos_rootfs
 device = auto
 
+[partition.data_partition]
+label = data_partition
+len = 20000
+type = linux
+
 [partition.sos_boot]
 label = sos_boot
 len = 100
@@ -16,11 +21,6 @@ type = linux
 
 [partition.sos_rootfs]
 label = sos_rootfs
-len = 4000
-type = linux
-
-[partition.data_partition]
-label = data_partition
 len = -1
 type = linux
 # ------------------ END MIX-IN DEFINITIONS ------------------