diff --git a/app/src/main/java/com/placeholder/ringhealth/domain/model/HealthModels.kt b/app/src/main/java/com/placeholder/ringhealth/domain/model/HealthModels.kt
new file mode 100644
index 0000000..e696e27
--- /dev/null
+++ b/app/src/main/java/com/placeholder/ringhealth/domain/model/HealthModels.kt
@@ -0,0 +1,63 @@
+package com.placeholder.ringhealth.domain.model
+
+/** 健康指标类型。路由与详情页以此区分。 */
+enum class MetricType {
+    STEP,
+    HEART_RATE,
+    SLEEP,
+    BLOOD_OXYGEN,
+    STRESS,
+    TEMPERATURE,
+    BLOOD_PRESSURE,
+}
+
+/** 历史数据的时间范围。 */
+enum class DateRange { WEEK, MONTH }
+
+/**
+ * 戒指设备状态。M2 接入蓝牙后由真实 SDK 填充，当前由 Mock 提供。
+ */
+data class RingDeviceState(
+    val connected: Boolean,
+    val name: String,
+    val batteryPercent: Int,
+    val firmwareVersion: String,
+    val charging: Boolean,
+)
+
+/**
+ * 今日健康概览。字段为 null 表示该指标未开启或暂无数据，UI 需展示“未开启”占位而非 0。
+ */
+data class HealthSummary(
+    val steps: Int,
+    val stepGoal: Int,
+    val calories: Int,
+    val distanceKm: Double,
+    val heartRate: Int?,
+    val sleepMinutes: Int?,
+    val bloodOxygen: Int?,
+    val stress: Int?,
+    val temperature: Double?,
+    val bloodPressure: String?,
+)
+
+/** 一条历史数据点。 */
+data class MetricPoint(val timestamp: Long, val value: Double)
+
+/** 一条运动记录。 */
+data class WorkoutRecord(
+    val id: String,
+    val type: String,
+    val startTime: Long,
+    val durationMinutes: Int,
+    val distanceKm: Double,
+    val calories: Int,
+)
+
+/** 戒指功能开关项（对应协议中的自动监测开关）。 */
+data class DeviceFunctionSetting(
+    val id: String,
+    val title: String,
+    val subtitle: String,
+    val enabled: Boolean,
+)
diff --git a/app/src/main/java/com/placeholder/ringhealth/domain/repository/Repositories.kt b/app/src/main/java/com/placeholder/ringhealth/domain/repository/Repositories.kt
new file mode 100644
index 0000000..ec87243
--- /dev/null
+++ b/app/src/main/java/com/placeholder/ringhealth/domain/repository/Repositories.kt
@@ -0,0 +1,42 @@
+package com.placeholder.ringhealth.domain.repository
+
+import com.placeholder.ringhealth.domain.model.DateRange
+import com.placeholder.ringhealth.domain.model.DeviceFunctionSetting
+import com.placeholder.ringhealth.domain.model.HealthSummary
+import com.placeholder.ringhealth.domain.model.MetricPoint
+import com.placeholder.ringhealth.domain.model.MetricType
+import com.placeholder.ringhealth.domain.model.RingDeviceState
+import com.placeholder.ringhealth.domain.model.WorkoutRecord
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.StateFlow
+
+/**
+ * 健康数据来源。M1 由 Mock 实现，M2/M3 由厂商 SDK 适配层实现，UI 无需改动。
+ */
+interface HealthDataRepository {
+    /** 今日概览，随数据变化持续发射。 */
+    fun observeTodaySummary(): Flow<HealthSummary>
+
+    /** 指定指标在指定时间范围内的历史数据。 */
+    fun observeMetricHistory(metric: MetricType, range: DateRange): Flow<List<MetricPoint>>
+
+    /** 运动记录列表。 */
+    fun observeWorkouts(): Flow<List<WorkoutRecord>>
+}
+
+/**
+ * 戒指设备状态与功能开关。M2 接入蓝牙后由真实实现替换。
+ */
+interface RingDeviceRepository {
+    /** 设备状态（连接/电量/固件）。 */
+    val deviceState: StateFlow<RingDeviceState>
+
+    /** 功能开关列表。 */
+    val functionSettings: StateFlow<List<DeviceFunctionSetting>>
+
+    /** 主动刷新设备状态。 */
+    suspend fun refreshDeviceState()
+
+    /** 切换某个功能开关（M1 仅改内存状态）。 */
+    fun setFunctionEnabled(id: String, enabled: Boolean)
+}