diff --git a/compiler_base/error/Cargo.toml b/compiler_base/error/Cargo.toml
index e614b79f9..58f3764bf 100644
--- a/compiler_base/error/Cargo.toml
+++ b/compiler_base/error/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "compiler_base_error"
-version = "0.0.8"
+version = "0.0.9"
 edition = "2021"
 authors = ["zongzhe1024@163.com"]
 license = "Apache-2.0 OR MIT"
diff --git a/compiler_base/error/src/diagnostic/diagnostic_handler.rs b/compiler_base/error/src/diagnostic/diagnostic_handler.rs
index ae2b99bf6..805a6cb72 100644
--- a/compiler_base/error/src/diagnostic/diagnostic_handler.rs
+++ b/compiler_base/error/src/diagnostic/diagnostic_handler.rs
@@ -10,8 +10,8 @@
 //! For more information about template loader, see doc in "compiler_base/error/src/diagnostic/diagnostic_message.rs".
 
 use crate::{
-    diagnostic::diagnostic_message::TemplateLoader, Diagnostic, DiagnosticStyle, Emitter,
-    EmitterWriter,
+    diagnostic::diagnostic_message::TemplateLoader, emit_diagnostic_to_uncolored_text,
+    emitter::EmitResultText, Diagnostic, DiagnosticStyle, Emitter, EmitterWriter,
 };
 use anyhow::{bail, Context, Result};
 use compiler_base_span::fatal_error::FatalError;
@@ -256,6 +256,62 @@ impl DiagnosticHandler {
         }
     }
 
+    /// Emit all the diagnostics into strings and return.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use compiler_base_error::DiagnosticStyle;
+    /// use compiler_base_error::diagnostic_handler::DiagnosticHandler;
+    /// use compiler_base_error::Diagnostic;
+    /// use compiler_base_error::components::Label;
+    ///
+    /// let mut diag_1 = Diagnostic::<DiagnosticStyle>::new();
+    /// diag_1.append_component(Box::new(Label::Note));
+    ///
+    /// let mut diag_handler = DiagnosticHandler::default();
+    ///
+    /// assert_eq!(diag_handler.diagnostics_count().unwrap(), 0);
+    ///
+    /// diag_handler.add_err_diagnostic(diag_1);
+    /// assert_eq!(diag_handler.diagnostics_count().unwrap(), 1);
+    /// assert_eq!(diag_handler.emit_all_diags_into_string().unwrap().get(0).unwrap().as_ref().unwrap(), "note");
+    /// ```
+    pub fn emit_all_diags_into_string(&mut self) -> Result<Vec<Result<String>>> {
+        match self.handler_inner.lock() {
+            Ok(inner) => Ok(inner.emit_all_diags_into_string()),
+            Err(_) => bail!("Emit Diagnostics Failed."),
+        }
+    }
+
+    /// Emit the [`index`]th diagnostics into strings and return.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use compiler_base_error::DiagnosticStyle;
+    /// use compiler_base_error::diagnostic_handler::DiagnosticHandler;
+    /// use compiler_base_error::Diagnostic;
+    /// use compiler_base_error::components::Label;
+    ///
+    /// let mut diag_1 = Diagnostic::<DiagnosticStyle>::new();
+    /// diag_1.append_component(Box::new(Label::Note));
+    ///
+    /// let mut diag_handler = DiagnosticHandler::default();
+    ///
+    /// assert_eq!(diag_handler.diagnostics_count().unwrap(), 0);
+    ///
+    /// diag_handler.add_err_diagnostic(diag_1);
+    /// assert_eq!(diag_handler.diagnostics_count().unwrap(), 1);
+    /// assert_eq!(diag_handler.emit_nth_diag_into_string(0).unwrap().unwrap().unwrap(), "note");
+    /// ```
+    pub fn emit_nth_diag_into_string(&mut self, index: usize) -> Result<Option<Result<String>>> {
+        match self.handler_inner.lock() {
+            Ok(inner) => Ok(inner.emit_nth_diag_into_string(index)),
+            Err(_) => bail!("Emit Diagnostics Failed."),
+        }
+    }
+
     /// Emit the diagnostic messages generated from error to to terminal stderr.
     ///
     /// # Examples
@@ -587,6 +643,21 @@ impl DiagnosticHandlerInner {
         self.diagnostics.len()
     }
 
+    /// Emit all the diagnostics into strings and return.
+    pub(crate) fn emit_all_diags_into_string(&self) -> Vec<Result<String>> {
+        self.diagnostics
+            .iter()
+            .map(|d| Ok(emit_diagnostic_to_uncolored_text(d)?))
+            .collect()
+    }
+
+    /// Emit the [`index`]th diagnostic into string and return.
+    pub(crate) fn emit_nth_diag_into_string(&self, index: usize) -> Option<Result<String>> {
+        self.diagnostics
+            .get(index)
+            .map(|d| emit_diagnostic_to_uncolored_text(d))
+    }
+
     /// Emit the diagnostic messages generated from error to to terminal stderr.
     pub(crate) fn emit_error_diagnostic(
         &mut self,
diff --git a/compiler_base/error/src/emitter.rs b/compiler_base/error/src/emitter.rs
index 754f415c2..bcf336942 100644
--- a/compiler_base/error/src/emitter.rs
+++ b/compiler_base/error/src/emitter.rs
@@ -447,7 +447,7 @@ pub fn emit_diagnostic_to_uncolored_text(diag: &Diagnostic<DiagnosticStyle>) ->
 
 /// Used to save the result of emit into a [`String`],
 /// because trait [`Write`] and [`Send`] cannot be directly implemented by [`String`].
-struct EmitResultText {
+pub(crate) struct EmitResultText {
     test_res: String,
 }
 
diff --git a/compiler_base/error/src/tests.rs b/compiler_base/error/src/tests.rs
index 60fa1fc9d..dfa1cd3cc 100644
--- a/compiler_base/error/src/tests.rs
+++ b/compiler_base/error/src/tests.rs
@@ -146,8 +146,9 @@ mod test_errors {
 
 mod test_emitter {
     use crate::{
-        components::Label, emit_diagnostic_to_uncolored_text, emitter::Destination, Diagnostic,
-        Emitter, EmitterWriter,
+        components::Label, diagnostic_handler::DiagnosticHandler,
+        emit_diagnostic_to_uncolored_text, emitter::Destination, Diagnostic, Emitter,
+        EmitterWriter,
     };
     use std::io::{self, Write};
     use termcolor::Ansi;