diff --git a/app/src/protyle/toolbar/index.ts b/app/src/protyle/toolbar/index.ts
index 846217d4a..cc26cfd16 100644
--- a/app/src/protyle/toolbar/index.ts
+++ b/app/src/protyle/toolbar/index.ts
@@ -491,10 +491,33 @@ export class Toolbar {
                             inlineElement.setAttribute("data-type", type);
                             inlineElement.textContent = item.textContent;
                             setFontStyle(inlineElement, textObj);
-                            if (type === "text" && !inlineElement.getAttribute("style")) {
-                                newNodes.push(item);
+                            // 合并相同元素 https://github.com/siyuan-note/siyuan/issues/14290
+                            const previousIsSame = index === 0 && previousElement && previousElement.nodeType !== 3 &&
+                               type === previousElement.getAttribute("data-type") &&
+                                hasSameTextStyle(inlineElement, previousElement, textObj)
+                            const nextIsSame = index === contents.childNodes.length - 1 && nextElement && nextElement.nodeType !== 3 &&
+                               type === nextElement.getAttribute("data-type") &&
+                                hasSameTextStyle(inlineElement, nextElement, textObj)
+                            if (previousIsSame) {
+                                if (previousIsSame) {
+                                    previousIndex = previousElement.textContent.length;
+                                    previousElement.innerHTML = previousElement.innerHTML + inlineElement.innerHTML;
+                                    if (nextIsSame) {
+                                        nextIndex = previousElement.textContent.length;
+                                        previousElement.innerHTML = previousElement.innerHTML + nextElement.innerHTML;
+                                        nextElement.remove();
+                                        nextElement = previousElement;
+                                    }
+                                }
+                            } else if (nextIsSame) {
+                                nextIndex = inlineElement.textContent.length;
+                                nextElement.innerHTML = inlineElement.innerHTML + nextElement.innerHTML;
                             } else {
-                                newNodes.push(inlineElement);
+                                if (type === "text" && !inlineElement.getAttribute("style")) {
+                                    newNodes.push(item);
+                                } else {
+                                    newNodes.push(inlineElement);
+                                }
                             }
                         } else {
                             newNodes.push(item);
@@ -590,14 +613,24 @@ export class Toolbar {
                                 item.setAttribute("data-subtype", "s");
                             }
                         }
-                        if (index === 0 && previousElement && previousElement.nodeType !== 3 &&
+                        const previousIsSame = index === 0 && previousElement && previousElement.nodeType !== 3 &&
                             isArrayEqual(types, (previousElement.getAttribute("data-type") || "").split(" ")) &&
-                            hasSameTextStyle(item, previousElement, textObj)) {
-                            previousIndex = previousElement.textContent.length;
-                            previousElement.innerHTML = previousElement.innerHTML + item.innerHTML;
-                        } else if (index === contents.childNodes.length - 1 && nextElement && nextElement.nodeType !== 3 &&
+                            hasSameTextStyle(item, previousElement, textObj)
+                        const nextIsSame = index === contents.childNodes.length - 1 && nextElement && nextElement.nodeType !== 3 &&
                             isArrayEqual(types, (nextElement.getAttribute("data-type") || "").split(" ")) &&
-                            hasSameTextStyle(item, nextElement, textObj)) {
+                            hasSameTextStyle(item, nextElement, textObj)
+                        if (previousIsSame) {
+                            if (previousIsSame) {
+                                previousIndex = previousElement.textContent.length;
+                                previousElement.innerHTML = previousElement.innerHTML + item.innerHTML;
+                                if (nextIsSame) {
+                                    nextIndex = previousElement.textContent.length;
+                                    previousElement.innerHTML = previousElement.innerHTML + nextElement.innerHTML;
+                                    nextElement.remove();
+                                    nextElement = previousElement;
+                                }
+                            }
+                        } else if (nextIsSame) {
                             nextIndex = item.textContent.length;
                             nextElement.innerHTML = item.innerHTML + nextElement.innerHTML;
                         } else if (item.tagName !== "BR" && item.tagName !== "IMG") {
@@ -774,7 +807,7 @@ export class Toolbar {
         if (nextElement) {
             this.mergeNode(nextElement.childNodes);
         }
-        if (previousIndex) {
+        if (typeof previousIndex === "number") {
             this.range.setStart(previousElement.firstChild, previousIndex);
         } else if (newNodes.length > 0) {
             if (newNodes[0].nodeType !== 3 && (newNodes[0] as HTMLElement).getAttribute("data-type") === "inline-math") {
@@ -798,7 +831,7 @@ export class Toolbar {
             // aaa**bbb** 选中 aaa 加粗
             this.range.setStart(nextElement.firstChild, 0);
         }
-        if (nextIndex) {
+        if (typeof nextIndex === "number") {
             this.range.setEnd(nextElement.lastChild, nextIndex);
         } else if (newNodes.length > 0) {
             const lastNewNode = newNodes[newNodes.length - 1];