diff --git a/.changelog/3113.txt b/.changelog/3113.txt
new file mode 100644
index 0000000000..9fac48afcf
--- /dev/null
+++ b/.changelog/3113.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_cdn_domain: `header_mode` support `set`
+```
diff --git a/tencentcloud/services/cdn/resource_tc_cdn_domain.go b/tencentcloud/services/cdn/resource_tc_cdn_domain.go
index 84ab13b111..140ffd32d3 100644
--- a/tencentcloud/services/cdn/resource_tc_cdn_domain.go
+++ b/tencentcloud/services/cdn/resource_tc_cdn_domain.go
@@ -634,7 +634,7 @@ func ResourceTencentCloudCdnDomain() *schema.Resource {
 									"header_mode": {
 										Type:        schema.TypeString,
 										Required:    true,
-										Description: "Http header setting method. The following types are supported: `add`: add a head, if a head already exists, there will be a duplicate head, `del`: delete the head.",
+										Description: "Http header setting method. The following types are supported: `set`: sets a value for an existing header parameter, a new header parameter, or multiple header parameters. Multiple header parameters will be merged into one; `del`: deletes a header parameter; `add`: adds a header parameter. By default, you can repeat the same action to add the same header parameter, which may affect browser response. Please consider the set operation first.",
 									},
 									"header_name": {
 										Type:         schema.TypeString,
diff --git a/tencentcloud/services/emr/resource_tc_emr_cluster.md b/tencentcloud/services/emr/resource_tc_emr_cluster.md
index 53c57ff5d6..6e6f43e052 100644
--- a/tencentcloud/services/emr/resource_tc_emr_cluster.md
+++ b/tencentcloud/services/emr/resource_tc_emr_cluster.md
@@ -1,4 +1,4 @@
-Provide a resource to create a emr cluster.
+Provide a resource to create an emr cluster.
 
 Example Usage
 
@@ -8,14 +8,14 @@ variable "availability_zone" {
 }
 
 data "tencentcloud_instance_types" "cvm4c8m" {
-	exclude_sold_out=true
-	cpu_core_count=4
-	memory_size=8
-    filter {
-      name   = "instance-charge-type"
-      values = ["POSTPAID_BY_HOUR"]
-    }
-    filter {
+  exclude_sold_out = true
+  cpu_core_count   = 4
+  memory_size      = 8
+  filter {
+    name   = "instance-charge-type"
+    values = ["POSTPAID_BY_HOUR"]
+  }
+  filter {
     name   = "zone"
     values = [var.availability_zone]
   }
@@ -41,52 +41,52 @@ resource "tencentcloud_security_group" "emr_sg" {
 }
 
 resource "tencentcloud_emr_cluster" "emr_cluster" {
-	product_id=38
-	vpc_settings={
-	  vpc_id=tencentcloud_vpc.emr_vpc.id
-      subnet_id=tencentcloud_subnet.emr_subnet.id
-	}
-	softwares = [
-	  "hdfs-2.8.5",
-	  "knox-1.6.1",
-	  "openldap-2.4.44",
-	  "yarn-2.8.5",
-	  "zookeeper-3.6.3",
-	]
-	support_ha=0
-	instance_name="emr-cluster-test"
-	resource_spec {
-	  master_resource_spec {
-		mem_size=8192
-		cpu=4
-		disk_size=100
-		disk_type="CLOUD_PREMIUM"
-		spec="CVM.${data.tencentcloud_instance_types.cvm4c8m.instance_types.0.family}"
-		storage_type=5
-		root_size=50
-	  }
-	  core_resource_spec {
-		mem_size=8192
-		cpu=4
-		disk_size=100
-		disk_type="CLOUD_PREMIUM"
-		spec="CVM.${data.tencentcloud_instance_types.cvm4c8m.instance_types.0.family}"
-		storage_type=5
-		root_size=50
-	  }
-	  master_count=1
-	  core_count=2
-	}
-	login_settings={
-	  password="Tencent@cloud123"
-	}
-	time_span=3600
-	time_unit="s"
-	pay_mode=0
-	placement_info={
-	  zone=var.availability_zone
-	  project_id=0
-	}
-	sg_id=tencentcloud_security_group.emr_sg.id
+  product_id   = 38
+  vpc_settings = {
+    vpc_id    = tencentcloud_vpc.emr_vpc.id
+    subnet_id = tencentcloud_subnet.emr_subnet.id
+  }
+  softwares = [
+    "hdfs-2.8.5",
+    "knox-1.6.1",
+    "openldap-2.4.44",
+    "yarn-2.8.5",
+    "zookeeper-3.6.3",
+  ]
+  support_ha    = 0
+  instance_name = "emr-cluster-test"
+  resource_spec {
+    master_resource_spec {
+      mem_size     = 8192
+      cpu          = 4
+      disk_size    = 100
+      disk_type    = "CLOUD_PREMIUM"
+      spec         = "CVM.${data.tencentcloud_instance_types.cvm4c8m.instance_types.0.family}"
+      storage_type = 5
+      root_size    = 50
+    }
+    core_resource_spec {
+      mem_size     = 8192
+      cpu          = 4
+      disk_size    = 100
+      disk_type    = "CLOUD_PREMIUM"
+      spec         = "CVM.${data.tencentcloud_instance_types.cvm4c8m.instance_types.0.family}"
+      storage_type = 5
+      root_size    = 50
+    }
+    master_count = 1
+    core_count   = 2
+  }
+  login_settings = {
+    password = "Tencent@cloud123"
+  }
+  time_span = 3600
+  time_unit = "s"
+  pay_mode  = 0
+  placement_info {
+    zone       = var.availability_zone
+    project_id = 0
+  }
+  sg_id = tencentcloud_security_group.emr_sg.id
 }
 ```
\ No newline at end of file
diff --git a/website/docs/r/cdn_domain.html.markdown b/website/docs/r/cdn_domain.html.markdown
index fe10e75712..75169e283b 100644
--- a/website/docs/r/cdn_domain.html.markdown
+++ b/website/docs/r/cdn_domain.html.markdown
@@ -277,7 +277,7 @@ The `force_redirect` object of `https_config` supports the following:
 
 The `header_rules` object of `request_header` supports the following:
 
-* `header_mode` - (Required, String) Http header setting method. The following types are supported: `add`: add a head, if a head already exists, there will be a duplicate head, `del`: delete the head.
+* `header_mode` - (Required, String) Http header setting method. The following types are supported: `set`: sets a value for an existing header parameter, a new header parameter, or multiple header parameters. Multiple header parameters will be merged into one; `del`: deletes a header parameter; `add`: adds a header parameter. By default, you can repeat the same action to add the same header parameter, which may affect browser response. Please consider the set operation first.
 * `header_name` - (Required, String) Http header name.
 * `header_value` - (Required, String) Http header value, optional when Mode is `del`, Required when Mode is `add`/`set`.
 * `rule_paths` - (Required, List) Matching content under the corresponding type of CacheType: `all`: fill *, `file`: fill in the suffix name, such as jpg, txt, `directory`: fill in the path, such as /xxx/test, `path`: fill in the absolute path, such as /xxx/test.html.
diff --git a/website/docs/r/emr_cluster.html.markdown b/website/docs/r/emr_cluster.html.markdown
index 923b9012cc..97c83cb8e5 100644
--- a/website/docs/r/emr_cluster.html.markdown
+++ b/website/docs/r/emr_cluster.html.markdown
@@ -4,12 +4,12 @@ layout: "tencentcloud"
 page_title: "TencentCloud: tencentcloud_emr_cluster"
 sidebar_current: "docs-tencentcloud-resource-emr_cluster"
 description: |-
-  Provide a resource to create a emr cluster.
+  Provide a resource to create an emr cluster.
 ---
 
 # tencentcloud_emr_cluster
 
-Provide a resource to create a emr cluster.
+Provide a resource to create an emr cluster.
 
 ## Example Usage
 
@@ -94,7 +94,7 @@ resource "tencentcloud_emr_cluster" "emr_cluster" {
   time_span = 3600
   time_unit = "s"
   pay_mode  = 0
-  placement_info = {
+  placement_info {
     zone       = var.availability_zone
     project_id = 0
   }