diff --git a/inputmethod/include/inputmethod_text_config_capi.h b/inputmethod/include/inputmethod_text_config_capi.h
index ad639af2da400488b1ed116889b0f8e089f427c3..bb47678ddd563fb0cb24ac940727ea9713ec7c76 100644
--- a/inputmethod/include/inputmethod_text_config_capi.h
+++ b/inputmethod/include/inputmethod_text_config_capi.h
@@ -131,6 +131,22 @@ InputMethod_ErrorCode OH_TextConfig_SetSelection(InputMethod_TextConfig *config,
  */
 InputMethod_ErrorCode OH_TextConfig_SetWindowId(InputMethod_TextConfig *config, int32_t windowId);
 
+/**
+ * @brief Set capitalize mode into TextConfig.
+ *
+ * @param config Represents a pointer to an {@link InputMethod_TextConfig} instance which will be set.
+ * @param capitalizeMode The capitalize mode type of text Editor,
+ *      which is defined in {@link InputMethod_capitalizeMode}.
+ * @return Returns a specific error code.
+ *     {@link IME_ERR_OK} - success.
+ *     {@link IME_ERR_NULL_POINTER} - unexpected null pointer.
+ *     {@link IME_ERR_PARAMCHECK} - parameter check failed.
+ * Specific error codes can be referenced {@link InputMethod_ErrorCode}.
+ * @since 18
+ */
+InputMethod_ErrorCode OH_TextConfig_SetCapitalizeMode(InputMethod_TextConfig *config,
+    InputMethod_CapitalizeMode capitalizeMode);
+
 /**
  * @brief Get input type from TextConfig
  *
@@ -222,6 +238,21 @@ InputMethod_ErrorCode OH_TextConfig_GetSelection(InputMethod_TextConfig *config,
  * @since 12
  */
 InputMethod_ErrorCode OH_TextConfig_GetWindowId(InputMethod_TextConfig *config, int32_t *windowId);
+
+/**
+ * @brief get capitalize mode into TextConfig.
+ *
+ * @param config Represents a pointer to an {@link InputMethod_TextConfig} instance which will be set.
+ * @param capitalizeMode The capitalize mode type of text Editor,
+ *      which is defined in {@link InputMethod_capitalizeMode}.
+ * @return Returns a specific error code.
+ *     {@link IME_ERR_OK} - success.
+ *     {@link IME_ERR_NULL_POINTER} - unexpected null pointer.
+ * Specific error codes can be referenced {@link InputMethod_ErrorCode}.
+ * @since 18
+ */
+InputMethod_ErrorCode OH_TextConfig_GetCapitalizeMode(InputMethod_TextConfig *config,
+    InputMethod_CapitalizeMode *capitalizeMode);
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/inputmethod/include/inputmethod_types_capi.h b/inputmethod/include/inputmethod_types_capi.h
index b3848f15f6d779339a57b65296ac86d34a726394..32b57bdc3937e15441593454ae7a4b5760afb6a6 100644
--- a/inputmethod/include/inputmethod_types_capi.h
+++ b/inputmethod/include/inputmethod_types_capi.h
@@ -325,6 +325,30 @@ typedef enum InputMethod_RequestKeyboardReason {
      */
     IME_REQUEST_REASON_OTHER = 20
 } InputMethod_RequestKeyboardReason;
+
+/**
+ * @brief The value type of capitalize mode.
+ *
+ * @since 18
+ */
+typedef enum InputMethod_CapitalizeMode {
+    /**
+     * Value type is case-insensitive.
+     */
+    NONE = 0,
+    /**
+     * Value type is capitalize the first letter of the sentence.
+     */
+    SENTENCES = 1,
+    /**
+     * Value type is capitalize each word.
+     */
+    WORDS = 2,
+    /**
+     * Value type is capitalize each letter.
+     */
+    CHARACTERS = 3
+} InputMethod_CapitalizeMode;
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */