diff --git a/src/layouts/MarkdownPostLayout.astro b/src/layouts/MarkdownPostLayout.astro
index 50b02e3..f7cab2b 100644
--- a/src/layouts/MarkdownPostLayout.astro
+++ b/src/layouts/MarkdownPostLayout.astro
@@ -81,6 +81,11 @@ const t = getTranslations(lang);
       <slot />
     </div>
 
+    <dialog id="image-preview-dialog" class="image-preview-dialog">
+      <button class="image-preview-close" aria-label="关闭图片预览">×</button>
+      <img id="image-preview-img" alt="" />
+    </dialog>
+
     <PostNav post={post} lang={lang} />
 
     <h2>{comments}</h2>
@@ -116,6 +121,42 @@ const t = getTranslations(lang);
   })}
 />
 
+<script is:inline>
+  function initImagePreview() {
+    const dialog = document.getElementById("image-preview-dialog");
+    const previewImg = document.getElementById("image-preview-img");
+    const closeBtn = dialog?.querySelector(".image-preview-close");
+
+    if (!dialog || !previewImg || !closeBtn) return;
+
+    document.querySelectorAll("article img").forEach((img) => {
+      if (img.dataset.previewBound === "true") return;
+      img.dataset.previewBound = "true";
+
+      img.addEventListener("click", () => {
+        previewImg.src = img.currentSrc || img.src;
+        previewImg.alt = img.alt || "";
+        dialog.showModal();
+      });
+    });
+
+    closeBtn.addEventListener("click", () => {
+      dialog.close();
+      previewImg.removeAttribute("src");
+    });
+
+    dialog.addEventListener("click", (event) => {
+      if (event.target === dialog) {
+        dialog.close();
+        previewImg.removeAttribute("src");
+      }
+    });
+  }
+
+  document.addEventListener("DOMContentLoaded", initImagePreview);
+  document.addEventListener("astro:page-load", initImagePreview);
+</script>
+
 <script>
   const initFloatingActions = () => {
     const backButton = document.getElementById("back-button");
diff --git a/src/styles/dialog.css b/src/styles/dialog.css
new file mode 100644
index 0000000..e109c98
--- /dev/null
+++ b/src/styles/dialog.css
@@ -0,0 +1,57 @@
+.image-preview-dialog {
+    padding: 0;
+    border: none;
+    background: transparent;
+    max-width: min(96vw, 1200px);
+    max-height: 96vh;
+}
+
+.image-preview-dialog::backdrop {
+    background: rgba(0, 0, 0, 0.72);
+    backdrop-filter: blur(6px);
+}
+
+.image-preview-dialog img {
+    display: block;
+    max-width: 96vw;
+    max-height: 90vh;
+    object-fit: contain;
+    border-radius: 16px;
+    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.45);
+}
+
+.image-preview-close:focus {
+    outline: none;
+}
+
+.image-preview-close:focus-visible {
+    outline: 2px solid rgba(125, 162, 255, 0.9);
+    outline-offset: 4px;
+}
+
+.image-preview-close {
+    position: fixed;
+    top: 1.25rem;
+    right: 1.25rem;
+    z-index: 1;
+    width: 2.4rem;
+    height: 2.4rem;
+    border: none;
+    border-radius: 999px;
+    background: transparent;
+    color: var(--text-color-dark);
+    font-size: 2.6rem;
+    line-height: 1;
+    cursor: pointer;
+}
+
+/* .image-preview-close:hover {
+    background: rgba(0, 0, 0, 0.75);
+} */
+
+/* 给文章图片一个可点击提示 */
+.prose img,
+.markdown-body img,
+article img {
+    cursor: zoom-in;
+}
\ No newline at end of file
diff --git a/src/styles/global.css b/src/styles/global.css
index 5d6baf0..3b3501d 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -3,6 +3,7 @@
 @import url("https://unpkg.com/@fontsource/maple-mono@5.2.6/700.css");
 @import "./latest-comments.css";
 @import "./variables.css";
+@import "./dialog.css";
 
 pre {
   padding: 1rem;