diff --git a/src/auth/components/signup.vue b/src/auth/components/signup.vue
index b8df156..09bcaef 100644
--- a/src/auth/components/signup.vue
+++ b/src/auth/components/signup.vue
@@ -1,31 +1,25 @@
 <script lang='ts' setup>
 import { modalController } from "@ionic/vue";
+import VerifyCode from "./verify-code.vue";
 
-const name = ref();
-
-const cancel = () => modalController.dismiss(null, "cancel");
-const confirm = () => modalController.dismiss(name.value, "confirm");
+async function closeModal() {
+  await modalController.dismiss();
+}
 </script>
 
 <template>
-  <IonHeader>
-    <IonToolbar>
-      <IonButtons slot="start">
-        <IonButton color="medium" @click="cancel">
-          Cancel
-        </IonButton>
-      </IonButtons>
-      <IonTitle>Modal</IonTitle>
-      <IonButtons slot="end">
-        <IonButton :strong="true" @click="confirm">
-          Confirm
-        </IonButton>
-      </IonButtons>
-    </IonToolbar>
-  </IonHeader>
-  <IonContent class="ion-padding">
-    <IonItem>
-      <IonInput v-model="name" label-placement="stacked" label="Enter your name" placeholder="Your name" />
-    </IonItem>
-  </IonContent>
+  <IonPage>
+    <IonHeader class="ion-no-border">
+      <IonToolbar>
+        <IonButtons slot="start">
+          <IonButton @click="closeModal">
+            Close
+          </IonButton>
+        </IonButtons>
+      </IonToolbar>
+    </IonHeader>
+    <IonContent :fullscreen="true" class="ion-padding">
+      <VerifyCode />
+    </IonContent>
+  </IonPage>
 </template>
diff --git a/src/auth/components/verify-code.vue b/src/auth/components/verify-code.vue
new file mode 100644
index 0000000..2721253
--- /dev/null
+++ b/src/auth/components/verify-code.vue
@@ -0,0 +1,139 @@
+<script lang='ts' setup>
+import type { AuthUserSignup } from "../type";
+import { toastController } from "@ionic/vue";
+import { logoGoogle, phonePortraitOutline } from "ionicons/icons";
+import { emailPattern } from "@/utils";
+import { authClient } from "..";
+
+const form = ref<AuthUserSignup>({
+  email: "",
+  password: "",
+  confirmPassword: "",
+  verificationCode: "",
+});
+const step = ref(1);
+
+function onEmailBlur() {
+  const isEmailValid = emailPattern.test(form.value.email);
+  if (!isEmailValid) {
+    toastController
+      .create({
+        message: "Please enter a valid email address.",
+        duration: 1500,
+        position: "bottom",
+      })
+      .then((toast) => {
+        toast.present();
+      });
+  }
+}
+async function submitSendVerification() {
+  const isEmailValid = emailPattern.test(form.value.email);
+  if (!isEmailValid) {
+    const toast = await toastController.create({
+      message: "Please enter a valid email address.",
+      duration: 1500,
+      position: "bottom",
+    });
+
+    await toast.present();
+    return;
+  }
+
+  const { data, error } = await authClient.emailOtp.sendVerificationOtp({
+    email: form.value.email, // required
+    type: "sign-in", // required
+  });
+  if (data?.success) {
+    step.value = 2;
+  }
+  else {
+    const toast = await toastController.create({
+      message: error?.message || "Failed to send verification code.",
+      duration: 1500,
+      position: "bottom",
+    });
+
+    await toast.present();
+  }
+}
+
+function reset() {
+  step.value = 1;
+  form.value.email = "";
+  form.value.password = "";
+  form.value.confirmPassword = "";
+  form.value.verificationCode = "";
+}
+
+async function submitSignup() {
+  const { data, error } = await authClient.signIn.emailOtp({
+    email: form.value.email,
+    otp: form.value.verificationCode,
+  });
+  if (data?.token) {
+    reset();
+    step.value = 1;
+    const toast = await toastController.create({
+      message: "Email verified successfully!",
+      duration: 1500,
+      position: "bottom",
+    });
+
+    await toast.present();
+  }
+  else {
+    const toast = await toastController.create({
+      message: error?.message || "Failed to verify the code.",
+      duration: 1500,
+      position: "bottom",
+    });
+
+    await toast.present();
+  }
+}
+</script>
+
+<template>
+  <div v-if="step === 1">
+    <h1><strong>What's your email?</strong></h1>
+    <p>You'll use this email to login and access everything we have to offer.</p>
+
+    <div>
+      <ion-item>
+        <ion-input v-model="form.email" type="email" placeholder="Enter your email address" @ion-blur="onEmailBlur" />
+      </ion-item>
+
+      <ion-button expand="block" class="ion-margin-top" shape="round" @click="submitSendVerification">
+        Sign up
+      </ion-button>
+
+      <divider text="Or continue with" />
+
+      <ion-button color="medium" expand="block" class="ion-margin-top" shape="round">
+        <IonIcon slot="start" aria-hidden="true" :icon="phonePortraitOutline" />
+        Phone Number
+      </ion-button>
+      <ion-button color="medium" expand="block" class="ion-margin-top" shape="round">
+        <IonIcon slot="start" aria-hidden="true" :icon="logoGoogle" />
+        Google
+      </ion-button>
+    </div>
+  </div>
+  <div v-else-if="step === 2">
+    <h1><strong>Verify your email</strong></h1>
+    <p>We have sent a verification code to {{ form.email }}. Please enter the code below to verify your email address.</p>
+
+    <div>
+      <ion-item>
+        <ion-input-otp v-model="form.verificationCode" :length="6" />
+      </ion-item>
+
+      <ion-button expand="block" class="ion-margin-top" shape="round" @click="submitSignup">
+        Submit
+      </ion-button>
+    </div>
+  </div>
+</template>
+
+<style lang='css' scoped></style>
diff --git a/src/auth/index.ts b/src/auth/index.ts
index 4d597ba..28565af 100644
--- a/src/auth/index.ts
+++ b/src/auth/index.ts
@@ -1,12 +1,19 @@
 import { modalController } from "@ionic/vue";
+import { emailOTPClient } from "better-auth/client/plugins";
 import { createAuthClient } from "better-auth/vue";
+import SignupContent from "./components/signup.vue";
 
 export const authClient = createAuthClient({
   baseURL: import.meta.env.VITE_BASE_API_URL, // The base URL of your auth server
+  plugins: [emailOTPClient()],
 });
 
-export function signupController() {
-  return modalController.create({
-    component: () => import("./components/signup.vue"),
+export async function modelControllerSignup(presentingElement?: HTMLElement) {
+  const modal = await modalController.create({
+    component: SignupContent,
+    presentingElement,
+    canDismiss: async (data, role) => role !== "gesture",
   });
+
+  return modal;
 }
diff --git a/src/auth/type.ts b/src/auth/type.ts
new file mode 100644
index 0000000..f2076c1
--- /dev/null
+++ b/src/auth/type.ts
@@ -0,0 +1,6 @@
+export interface AuthUserSignup {
+  email: string;
+  password: string;
+  confirmPassword: string;
+  verificationCode: string;
+}
diff --git a/src/composables/useAuth.ts b/src/composables/useAuth.ts
new file mode 100644
index 0000000..e23ed69
--- /dev/null
+++ b/src/composables/useAuth.ts
@@ -0,0 +1,15 @@
+import { authClient } from "@/auth";
+
+export function useAuth() {
+  // Better Auth 提供的 session
+  const session = authClient.useSession();
+
+  const user = computed(() => session.value.data?.user);
+  const isAuthenticated = computed(() => !!session.value.data);
+
+  return {
+    user,
+    session,
+    isAuthenticated,
+  };
+}
diff --git a/src/utils/index.ts b/src/utils/index.ts
new file mode 100644
index 0000000..7cd62fb
--- /dev/null
+++ b/src/utils/index.ts
@@ -0,0 +1,2 @@
+export * from "./ionic-helper";
+export * from "./pattern";
diff --git a/src/utils/ionic-helper.ts b/src/utils/ionic-helper.ts
new file mode 100644
index 0000000..c30ee43
--- /dev/null
+++ b/src/utils/ionic-helper.ts
@@ -0,0 +1 @@
+export type PageInstance = InstanceType<typeof import("@ionic/vue").IonPage>;
diff --git a/src/utils/pattern.ts b/src/utils/pattern.ts
new file mode 100644
index 0000000..8d09dc6
--- /dev/null
+++ b/src/utils/pattern.ts
@@ -0,0 +1 @@
+export const emailPattern = /^[^\s@]+@[^\s@][^\s.@]*\.[^\s@]+$/;