diff --git a/components/modes/bazi-form.tsx b/components/modes/bazi-form.tsx
index c41efca..861fe9f 100644
--- a/components/modes/bazi-form.tsx
+++ b/components/modes/bazi-form.tsx
@@ -8,7 +8,9 @@ import { ZenCard } from "@/components/ui/zen-card";
 import { ModeWorkspace } from "@/components/layout/mode-workspace";
 import ResultAI from "@/components/result-ai";
 import BaziChartDisplay from "@/components/modes/bazi-chart";
-import DateTimePicker, { nowDateString } from "@/components/shared/datetime-picker";
+import LunarBirthPicker, {
+  todaySolarYmd,
+} from "@/components/shared/lunar-birth-picker";
 import RegionSelect, {
   useRegionLocation,
 } from "@/components/shared/region-select";
@@ -16,7 +18,7 @@ import { calculateBazi, type BaziChart } from "@/lib/calc/bazi";
 import { streamAiCompletion } from "@/lib/ai/client-stream";
 
 export default function BaziForm() {
-  const [date, setDate] = useState(nowDateString());
+  const [date, setDate] = useState(todaySolarYmd());
   const [time, setTime] = useState("12:00");
   const [unknownHour, setUnknownHour] = useState(false);
   const [gender, setGender] = useState<"male" | "female">("male");
@@ -110,12 +112,12 @@ export default function BaziForm() {
       }
     >
       <ZenCard title="出生 · 命局" subtitle="四柱排盘所需信息" className="flex h-full min-h-0 flex-col">
-        <DateTimePicker
+        <LunarBirthPicker
           label="出生日期 / 时间"
-          date={date}
+          solarDate={date}
           time={time}
           timeDisabled={unknownHour}
-          onDateChange={setDate}
+          onSolarDateChange={setDate}
           onTimeChange={setTime}
         />
         <label className="flex items-center gap-2 text-xs text-muted-foreground">
diff --git a/components/modes/combined-form.tsx b/components/modes/combined-form.tsx
index a81cd03..04e9e8d 100644
--- a/components/modes/combined-form.tsx
+++ b/components/modes/combined-form.tsx
@@ -9,6 +9,9 @@ import { ModeWorkspace } from "@/components/layout/mode-workspace";
 import Result from "@/components/result";
 import ResultAI from "@/components/result-ai";
 import BaziChartDisplay from "@/components/modes/bazi-chart";
+import LunarBirthPicker, {
+  todaySolarYmd,
+} from "@/components/shared/lunar-birth-picker";
 import DateTimePicker, {
   nowDateString,
   nowTimeString,
@@ -22,7 +25,7 @@ import type { GuaResult } from "@/lib/calc/hexagram";
 import { streamAiCompletion } from "@/lib/ai/client-stream";
 
 export default function CombinedForm() {
-  const [birthDate, setBirthDate] = useState("1990-01-01");
+  const [birthDate, setBirthDate] = useState(todaySolarYmd());
   const [birthTime, setBirthTime] = useState("12:00");
   const [unknownHour, setUnknownHour] = useState(false);
   const [gender, setGender] = useState<"male" | "female">("male");
@@ -163,12 +166,12 @@ export default function CombinedForm() {
       }
     >
       <ZenCard title="人和 · 生辰" subtitle="出生时空与地域" className="flex h-full min-h-0 flex-col">
-        <DateTimePicker
-          label="出生日期 / 时间"
-          date={birthDate}
+        <LunarBirthPicker
+          label="出生日期 / 时间（农历）"
+          solarDate={birthDate}
           time={birthTime}
           timeDisabled={unknownHour}
-          onDateChange={setBirthDate}
+          onSolarDateChange={setBirthDate}
           onTimeChange={setBirthTime}
         />
         <label className="flex items-center gap-2 text-xs text-muted-foreground">
diff --git a/components/shared/lunar-birth-picker.tsx b/components/shared/lunar-birth-picker.tsx
new file mode 100644
index 0000000..a272c74
--- /dev/null
+++ b/components/shared/lunar-birth-picker.tsx
@@ -0,0 +1,139 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+import {
+  formatLunarLabel,
+  formatSolarLabel,
+  lunarToSolarYmd,
+  solarYmdToLunarParts,
+  todayLunarParts,
+  todaySolarYmd,
+  type LunarDateParts,
+} from "@/lib/calc/lunar-date";
+
+interface LunarBirthPickerProps {
+  solarDate: string;
+  time: string;
+  onSolarDateChange: (solarYmd: string) => void;
+  onTimeChange: (time: string) => void;
+  label?: string;
+  timeDisabled?: boolean;
+}
+
+const inputClass =
+  "rounded-md border bg-background px-3 py-2 text-sm disabled:opacity-50";
+
+export default function LunarBirthPicker({
+  solarDate,
+  time,
+  onSolarDateChange,
+  onTimeChange,
+  label = "出生日期 / 时间",
+  timeDisabled = false,
+}: LunarBirthPickerProps) {
+  const [lunar, setLunar] = useState<LunarDateParts>(() => {
+    return solarYmdToLunarParts(solarDate) ?? todayLunarParts();
+  });
+
+  useEffect(() => {
+    const parsed = solarYmdToLunarParts(solarDate);
+    if (parsed) {
+      setLunar(parsed);
+    }
+  }, [solarDate]);
+
+  const solarYmd = useMemo(() => lunarToSolarYmd(lunar), [lunar]);
+  const lunarLabel = useMemo(() => formatLunarLabel(lunar), [lunar]);
+  const solarLabel = useMemo(
+    () => (solarYmd ? formatSolarLabel(solarYmd) : null),
+    [solarYmd],
+  );
+
+  useEffect(() => {
+    if (solarYmd && solarYmd !== solarDate) {
+      onSolarDateChange(solarYmd);
+    }
+  }, [solarYmd, solarDate, onSolarDateChange]);
+
+  function updateLunar(patch: Partial<LunarDateParts>) {
+    setLunar((prev) => ({ ...prev, ...patch }));
+  }
+
+  return (
+    <div className="space-y-2">
+      <label className="text-sm font-medium">{label}</label>
+      <p className="text-xs text-muted-foreground">请按农历（阴历）填写出生日期</p>
+
+      <div className="grid grid-cols-3 gap-2">
+        <div className="space-y-1">
+          <span className="text-xs text-muted-foreground">农历年</span>
+          <input
+            type="number"
+            className={inputClass + " w-full"}
+            min={1900}
+            max={2100}
+            value={lunar.year}
+            onChange={(e) => updateLunar({ year: Number(e.target.value) })}
+          />
+        </div>
+        <div className="space-y-1">
+          <span className="text-xs text-muted-foreground">农历月</span>
+          <input
+            type="number"
+            className={inputClass + " w-full"}
+            min={1}
+            max={12}
+            value={lunar.month}
+            onChange={(e) => updateLunar({ month: Number(e.target.value) })}
+          />
+        </div>
+        <div className="space-y-1">
+          <span className="text-xs text-muted-foreground">农历日</span>
+          <input
+            type="number"
+            className={inputClass + " w-full"}
+            min={1}
+            max={30}
+            value={lunar.day}
+            onChange={(e) => updateLunar({ day: Number(e.target.value) })}
+          />
+        </div>
+      </div>
+
+      <label className="flex items-center gap-2 text-xs text-muted-foreground">
+        <input
+          type="checkbox"
+          checked={lunar.isLeapMonth}
+          onChange={(e) => updateLunar({ isLeapMonth: e.target.checked })}
+        />
+        闰月
+      </label>
+
+      {lunarLabel && (
+        <p className="text-xs text-muted-foreground">农历：{lunarLabel}</p>
+      )}
+
+      {solarLabel ? (
+        <p className="rounded-md border border-primary/20 bg-primary/5 px-3 py-2 text-sm">
+          对应阳历：<span className="font-medium text-foreground">{solarLabel}</span>
+          <span className="ml-2 text-xs text-muted-foreground">({solarYmd})</span>
+        </p>
+      ) : (
+        <p className="text-sm text-destructive">农历日期无效，请检查年月日或闰月</p>
+      )}
+
+      <div className="space-y-1">
+        <span className="text-xs text-muted-foreground">出生时辰</span>
+        <input
+          type="time"
+          className={inputClass + " w-full sm:w-auto"}
+          value={time}
+          disabled={timeDisabled}
+          onChange={(e) => onTimeChange(e.target.value)}
+        />
+      </div>
+    </div>
+  );
+}
+
+export { todaySolarYmd };
diff --git a/lib/calc/lunar-date.ts b/lib/calc/lunar-date.ts
new file mode 100644
index 0000000..3b80cf6
--- /dev/null
+++ b/lib/calc/lunar-date.ts
@@ -0,0 +1,79 @@
+import { Lunar, Solar } from "lunar-javascript";
+
+export interface LunarDateParts {
+  year: number;
+  month: number;
+  day: number;
+  isLeapMonth: boolean;
+}
+
+/** 农历 → 阳历 YYYY-MM-DD，无效则 null */
+export function lunarToSolarYmd(parts: LunarDateParts): string | null {
+  try {
+    const month = parts.isLeapMonth ? -parts.month : parts.month;
+    const lunar = Lunar.fromYmd(parts.year, month, parts.day);
+    return lunar.getSolar().toYmd();
+  } catch {
+    return null;
+  }
+}
+
+/** 阳历 YYYY-MM-DD → 农历分量 */
+export function solarYmdToLunarParts(ymd: string): LunarDateParts | null {
+  try {
+    const [y, m, d] = ymd.split("-").map(Number);
+    if (!y || !m || !d) {
+      return null;
+    }
+    const lunar = Solar.fromYmd(y, m, d).getLunar();
+    const month = lunar.getMonth();
+    return {
+      year: lunar.getYear(),
+      month: Math.abs(month),
+      day: lunar.getDay(),
+      isLeapMonth: month < 0,
+    };
+  } catch {
+    return null;
+  }
+}
+
+/** 格式化农历显示 */
+export function formatLunarLabel(parts: LunarDateParts): string | null {
+  try {
+    const month = parts.isLeapMonth ? -parts.month : parts.month;
+    return Lunar.fromYmd(parts.year, month, parts.day).toString();
+  } catch {
+    return null;
+  }
+}
+
+/** 格式化阳历显示 */
+export function formatSolarLabel(ymd: string): string | null {
+  try {
+    const [y, m, d] = ymd.split("-").map(Number);
+    if (!y || !m || !d) {
+      return null;
+    }
+    const solar = Solar.fromYmd(y, m, d);
+    const week = ["日", "一", "二", "三", "四", "五", "六"][solar.getWeek()];
+    return `${y}年${m}月${d}日 星期${week}`;
+  } catch {
+    return null;
+  }
+}
+
+export function todayLunarParts(): LunarDateParts {
+  const lunar = Solar.fromDate(new Date()).getLunar();
+  const month = lunar.getMonth();
+  return {
+    year: lunar.getYear(),
+    month: Math.abs(month),
+    day: lunar.getDay(),
+    isLeapMonth: month < 0,
+  };
+}
+
+export function todaySolarYmd(): string {
+  return Solar.fromDate(new Date()).toYmd();
+}
diff --git a/types/lunar-javascript.d.ts b/types/lunar-javascript.d.ts
index 99f31c1..111abae 100644
--- a/types/lunar-javascript.d.ts
+++ b/types/lunar-javascript.d.ts
@@ -1,5 +1,10 @@
 declare module "lunar-javascript" {
   export class Solar {
+    static fromYmd(
+      year: number,
+      month: number,
+      day: number,
+    ): Solar;
     static fromYmdHms(
       year: number,
       month: number,
@@ -8,12 +13,24 @@ declare module "lunar-javascript" {
       minute: number,
       second: number,
     ): Solar;
+    static fromDate(date: Date): Solar;
     getLunar(): Lunar;
+    getWeek(): number;
     toYmd(): string;
     toYmdHms(): string;
+    toFullString(): string;
   }
 
   export class Lunar {
+    static fromYmd(
+      year: number,
+      month: number,
+      day: number,
+    ): Lunar;
+    getSolar(): Solar;
+    getYear(): number;
+    getMonth(): number;
+    getDay(): number;
     getEightChar(): EightChar;
     getDayInGanZhi(): string;
     getTimeInGanZhi(): string;