diff --git a/doc/mgmt/gnmi/SONiC_GNMI_Server_Interface_Design.md b/doc/mgmt/gnmi/SONiC_GNMI_Server_Interface_Design.md
index d97234ba3ad..dfabdfd3159 100644
--- a/doc/mgmt/gnmi/SONiC_GNMI_Server_Interface_Design.md
+++ b/doc/mgmt/gnmi/SONiC_GNMI_Server_Interface_Design.md
@@ -456,25 +456,24 @@ The full configuration request will be overwritten by subsequent full configurat
#### 1.2.1.12 Backward Compatibility
-SONiC telemetry is using prefix target to identify target database, and we will add a new target to support mixed schema.
-
- enum Target {
- option allow_alias = true;
- APPL_DB = 0;
- ASIC_DB = 1;
- COUNTERS_DB = 2;
- LOGLEVEL_DB = 3;
- CONFIG_DB = 4;
- // PFC_WD_DB shares the the same db number with FLEX_COUNTER_DB
- PFC_WD_DB = 5;
- FLEX_COUNTER_DB = 5;
- STATE_DB = 6;
- // For none-DB data
- OTHERS = 100;
- // For mixed schema
- MIXED_SCHEMA = 101;
- }
+GNMI native will support original telemetry schema for backward compatiblity, and we will use origin field to support new schema.
+
+#### 1.2.1.13 Improvement
+
+
+
+Current telemetry read has some limitations:
+* It cannot read the entire database.
+* It requires one GNMI path element per table key.
+ * telemetry needs to read database to identify table key and table field, that's impossible for write operation.
+ * telemetry does not support more than 2 table keys, but CONFIG_DB has table with 3 or 4 table keys.
+GNMI native will provide below improvements:
+* It can read the entire database.
+* It can support multiple ASIC device and smartswitch device in the second GNMI path element.
+* It put all table key with separator in the third GNMI path element.
+ * GNMI native can use the same schema for read operation and write operation.
+ * GNMI native can support more than 2 table keys.
### 1.2.2 Container
diff --git a/doc/mgmt/gnmi/images/imp_tree.svg b/doc/mgmt/gnmi/images/imp_tree.svg
new file mode 100644
index 00000000000..18c3883d0c0
--- /dev/null
+++ b/doc/mgmt/gnmi/images/imp_tree.svg
@@ -0,0 +1,275 @@
+
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