diff --git a/u2_history.user.js b/u2_history.user.js
new file mode 100644
index 0000000..df0c0a0
--- /dev/null
+++ b/u2_history.user.js
@@ -0,0 +1,224 @@
+// ==UserScript==
+// @name         保存个人说明历史
+// @namespace    https://github.com/lifegpc/userscript
+// @version      0.0.1
+// @description  保存个人说明历史
+// @author       lifegpc
+// @match        https://u2.dmhy.org/usercp.php?action=personal*
+// @icon         https://u2.dmhy.org/favicon.ico
+// ==/UserScript==
+/**@type {IDBDatabase} */
+let db = undefined;
+let need_reinit = false;
+let storage = navigator.storage || globalThis['WorkerNavigator']['storage'];
+async function make_storage_persist() {
+    let persisted = await storage.persisted();
+    if (!persisted) {
+        persisted = await storage.persist();
+    }
+    return persisted;
+}
+function init() {
+    return new Promise((resolve, reject) => {
+        make_storage_persist().then(() => {
+            if (db !== undefined && !need_reinit) {
+                resolve();
+                return;
+            }
+            let indexedReq = indexedDB.open('u2_history', 1);
+            /**@param {IDBVersionChangeEvent} event*/
+            indexedReq.onupgradeneeded = function (event) {
+                let db = this.result;
+                console.log(`upgrade u2_history from ${event.oldVersion} to ${event.newVersion}`);
+                /*No version or version < 1 -> v1 */
+                if (isNaN(event.oldVersion) || event.oldVersion < 1) {
+                    db.createObjectStore('info', { keyPath: 'time' });
+                }
+            }
+            indexedReq.onsuccess = () => {
+                db = indexedReq.result;
+                resolve();
+            }
+            indexedReq.onerror = () => {
+                need_reinit = true;
+                reject(indexedReq.error);
+            }
+        }).catch(reject);
+    })
+}
+/**
+ * @template T
+ * @param {(tx: IDBDatabase) => IDBRequest<T>} callback
+ * @returns {Promise<T>}
+ */
+function db_handle(callback) {
+    return new Promise((resolve, reject) => {
+        init().then(() => {
+            let req = callback(db);
+            req.onsuccess = () => {
+                let re = req.result;
+                resolve(re);
+            }
+            req.onerror = () => {
+                need_reinit = true;
+                reject(req.error);
+            }
+        }).catch(reject);
+    })
+}
+async function get_all_info_keys() {
+    return await db_handle(db => db.transaction('info').objectStore('info').getAllKeys());
+}
+async function get_info(time) {
+    let info = await db_handle(db => db.transaction('info').objectStore('info').get(time));
+    return info ? info.info : undefined;
+}
+async function delete_info(time) {
+    await db_handle(db => db.transaction('info', 'readwrite').objectStore('info').delete(time));
+}
+async function save_info(time, info) {
+    return await db_handle(db => db.transaction('info', 'readwrite').objectStore('info').put({ time, info }));
+}
+async function render_page() {}
+let times = await get_all_info_keys();
+let textarea = document.querySelector('textarea[name="info"]');
+let submit = document.querySelector('input[type="submit"]');
+if (!times.length) {
+    let info = textarea.value;
+    if (info) {
+        times.push(await save_info(new Date, info));
+    }
+}
+console.log(times)
+if (times.length) {
+    times.sort((a, b) => b.getTime() - a.getTime())
+    let details = document.createElement('details');
+    let summary = document.createElement('summary');
+    summary.innerText = '历史记录';
+    details.append(summary);
+    let body = document.createElement('div');
+    details.append(body);
+    textarea.parentElement.append(details);
+    let page = 0;
+    const count_per_page = 10;
+    /**
+     * @param {Date} time
+     * @param {string} info
+     */
+    function render_info(time, info) {
+        const details = document.createElement('details');
+        const summary = document.createElement('summary');
+        summary.innerText = time.toLocaleString();
+        details.append(summary);
+        const form = document.createElement('form');
+        form.target = '_blank';
+        form.action = "/tags.php";
+        form.method = "post";
+        details.append(form);
+        const ntextarea = document.createElement('textarea');
+        ntextarea.readOnly = true;
+        ntextarea.name = "test";
+        ntextarea.value = info;
+        ntextarea.style.width = textarea.style.width;
+        ntextarea.rows = textarea.rows;
+        form.append(ntextarea);
+        const line = document.createElement('div');
+        form.append(line);
+        const use = document.createElement('input');
+        use.type = "button";
+        use.value = "使用";
+        use.addEventListener('click', () => {
+            textarea.value = info;
+        })
+        line.append(use);
+        const preview = document.createElement('input');
+        preview.type = "submit";
+        preview.value = "预览";
+        line.append(preview);
+        const del = document.createElement('input');
+        del.type = "button";
+        del.value = "删除";
+        del.addEventListener('click', async () => {
+            await delete_info(time);
+            times = await get_all_info_keys();
+            times.sort((a, b) => b.getTime() - a.getTime());
+            await render_page();
+        })
+        line.append(del);
+        body.append(details);
+    }
+    async function render_page() {
+        body.innerHTML = '';
+        const total_page = Math.ceil(times.length / count_per_page);
+        if (page < 0) page = 0;
+        if (page >= total_page) page = total_page - 1;
+        const max = Math.min((page + 1) * count_per_page, times.length);
+        for (let i = page * count_per_page; i < max; i++) {
+            const time = times[i];
+            const info = await get_info(time);
+            render_info(time, info);
+        }
+        const line = document.createElement('div');
+        body.append(line);
+        const pagei = document.createElement('input');
+        pagei.type = 'number';
+        pagei.min = '1';
+        pagei.max = `${total_page}`;
+        pagei.value = `${page + 1}`;
+        pagei.addEventListener('change', () => {
+            page = pagei.valueAsNumber - 1;
+            render_page();
+        })
+        line.append(pagei);
+        line.append(`/${total_page}页`);
+        if (page > 0) {
+            const first = document.createElement('input');
+            first.type = 'button';
+            first.value = '首页';
+            first.addEventListener('click', () => {
+                page = 0;
+                render_page();
+            })
+            line.append(first);
+            const prev = document.createElement('input');
+            prev.type = 'button';
+            prev.value = '上一页';
+            prev.addEventListener('click', () => {
+                page--;
+                render_page();
+            })
+            line.append(prev);
+        }
+        if (page < total_page - 1) {
+            const next = document.createElement('input');
+            next.type = 'button';
+            next.value = '下一页';
+            next.addEventListener('click', () => {
+                page++;
+                render_page();
+            })
+            line.append(next);
+            const last = document.createElement('input');
+            last.type = 'button';
+            last.value = '尾页';
+            last.addEventListener('click', () => {
+                page = total_page - 1;
+                render_page();
+            })
+            line.append(last);
+        }
+    }
+    await render_page();
+} else {
+    let div = document.createElement('div');
+    div.innerText = "无历史记录";
+    textarea.parentElement.append(div);
+}
+submit.addEventListener('click', async () => {
+    const last_time = new Date(Math.max(...times));
+    const info_db = await get_info(last_time);
+    const info = textarea.value;
+    if (info != info_db) {
+        await save_info(new Date, info);
+    }
+})