diff --git a/core/src/services/azdls/backend.rs b/core/src/services/azdls/backend.rs
index 612ce98f71aa..33e3a0efe6a1 100644
--- a/core/src/services/azdls/backend.rs
+++ b/core/src/services/azdls/backend.rs
@@ -32,6 +32,7 @@ use super::error::parse_error;
 use super::pager::AzdlsPager;
 use super::writer::AzdlsWriter;
 use crate::raw::*;
+use crate::services::azdls::writer::AzdlsWriters;
 use crate::*;
 
 /// Known endpoint suffix Azure Data Lake Storage Gen2 URI syntax.
@@ -230,7 +231,7 @@ pub struct AzdlsBackend {
 impl Accessor for AzdlsBackend {
     type Reader = IncomingAsyncBody;
     type BlockingReader = ();
-    type Writer = oio::OneShotWriter<AzdlsWriter>;
+    type Writer = AzdlsWriters;
     type BlockingWriter = ();
     type Pager = AzdlsPager;
     type BlockingPager = ();
@@ -248,6 +249,7 @@ impl Accessor for AzdlsBackend {
                 read_with_range: true,
 
                 write: true,
+                write_can_append: true,
                 create_dir: true,
                 delete: true,
                 rename: true,
@@ -299,10 +301,13 @@ impl Accessor for AzdlsBackend {
     }
 
     async fn write(&self, path: &str, args: OpWrite) -> Result<(RpWrite, Self::Writer)> {
-        Ok((
-            RpWrite::default(),
-            oio::OneShotWriter::new(AzdlsWriter::new(self.core.clone(), args, path.to_string())),
-        ))
+        let w = AzdlsWriter::new(self.core.clone(), args.clone(), path.to_string());
+        let w = if args.append() {
+            AzdlsWriters::Two(oio::AppendObjectWriter::new(w))
+        } else {
+            AzdlsWriters::One(oio::OneShotWriter::new(w))
+        };
+        Ok((RpWrite::default(), w))
     }
 
     async fn rename(&self, from: &str, to: &str, _args: OpRename) -> Result<RpRename> {
diff --git a/core/src/services/azdls/core.rs b/core/src/services/azdls/core.rs
index d83f981a414c..d17296f9cb88 100644
--- a/core/src/services/azdls/core.rs
+++ b/core/src/services/azdls/core.rs
@@ -203,7 +203,8 @@ impl AzdlsCore {
     pub fn azdls_update_request(
         &self,
         path: &str,
-        size: Option<usize>,
+        size: Option<u64>,
+        position: u64,
         body: AsyncBody,
     ) -> Result<Request<AsyncBody>> {
         let p = build_abs_path(&self.root, path);
@@ -211,10 +212,11 @@ impl AzdlsCore {
         // - close: Make this is the final action to this file.
         // - flush: Flush the file directly.
         let url = format!(
-            "{}/{}/{}?action=append&close=true&flush=true&position=0",
+            "{}/{}/{}?action=append&close=true&flush=true&position={}",
             self.endpoint,
             self.filesystem,
-            percent_encode_path(&p)
+            percent_encode_path(&p),
+            position
         );
 
         let mut req = Request::patch(&url);
diff --git a/core/src/services/azdls/writer.rs b/core/src/services/azdls/writer.rs
index 2cbbac4f32fe..bc0201fbf4d4 100644
--- a/core/src/services/azdls/writer.rs
+++ b/core/src/services/azdls/writer.rs
@@ -26,6 +26,9 @@ use crate::raw::oio::WriteBuf;
 use crate::raw::*;
 use crate::*;
 
+pub type AzdlsWriters =
+    oio::TwoWaysWriter<oio::OneShotWriter<AzdlsWriter>, oio::AppendObjectWriter<AzdlsWriter>>;
+
 pub struct AzdlsWriter {
     core: Arc<AzdlsCore>,
 
@@ -65,7 +68,8 @@ impl oio::OneShotWrite for AzdlsWriter {
         let bs = oio::ChunkedBytes::from_vec(bs.vectored_bytes(bs.remaining()));
         let mut req = self.core.azdls_update_request(
             &self.path,
-            Some(bs.len()),
+            Some(bs.len() as u64),
+            0,
             AsyncBody::ChunkedBytes(bs),
         )?;
 
@@ -85,3 +89,40 @@ impl oio::OneShotWrite for AzdlsWriter {
         }
     }
 }
+
+#[async_trait]
+impl oio::AppendObjectWrite for AzdlsWriter {
+    async fn offset(&self) -> Result<u64> {
+        let resp = self.core.azdls_get_properties(&self.path).await?;
+
+        let status = resp.status();
+        let headers = resp.headers();
+
+        match status {
+            StatusCode::OK => Ok(parse_content_length(headers)?.unwrap_or_default()),
+            StatusCode::NOT_FOUND => Ok(0),
+            _ => Err(parse_error(resp).await?),
+        }
+    }
+
+    async fn append(&self, offset: u64, size: u64, body: AsyncBody) -> Result<()> {
+        let mut req = self
+            .core
+            .azdls_update_request(&self.path, Some(size), offset, body)?;
+
+        self.core.sign(&mut req).await?;
+
+        let resp = self.core.send(req).await?;
+
+        let status = resp.status();
+        match status {
+            StatusCode::OK | StatusCode::ACCEPTED => {
+                resp.into_body().consume().await?;
+                Ok(())
+            }
+            _ => Err(parse_error(resp)
+                .await?
+                .with_operation("Backend::azdls_update_request")),
+        }
+    }
+}