diff --git a/crates/erp-ai/src/dto.rs b/crates/erp-ai/src/dto.rs
new file mode 100644
index 0000000..ac69185
--- /dev/null
+++ b/crates/erp-ai/src/dto.rs
@@ -0,0 +1,102 @@
+use serde::{Deserialize, Serialize};
+
+// === 分析请求 ===
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnalyzeRequest {
+    pub analysis_type: AnalysisType,
+    pub source_ref: String,
+    pub options: AnalyzeOptions,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum AnalysisType {
+    LabReport,
+    Trends,
+    CheckupPlan,
+    ReportSummary,
+}
+
+impl AnalysisType {
+    pub fn as_str(&self) -> &str {
+        match self {
+            Self::LabReport => "lab_report",
+            Self::Trends => "trend",
+            Self::CheckupPlan => "checkup_plan",
+            Self::ReportSummary => "report_summary",
+        }
+    }
+
+    pub fn prompt_name(&self) -> &str {
+        match self {
+            Self::LabReport => "lab_report_interpretation",
+            Self::Trends => "health_trend_analysis",
+            Self::CheckupPlan => "personalized_checkup_plan",
+            Self::ReportSummary => "report_summary_generation",
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnalyzeOptions {
+    pub detail_level: Option<String>,
+    pub language: Option<String>,
+}
+
+impl Default for AnalyzeOptions {
+    fn default() -> Self {
+        Self {
+            detail_level: Some("patient_friendly".into()),
+            language: Some("zh-CN".into()),
+        }
+    }
+}
+
+// === AI Provider 请求/响应 ===
+
+#[derive(Debug, Clone)]
+pub struct GenerateRequest {
+    pub system_prompt: String,
+    pub user_prompt: String,
+    pub model: String,
+    pub temperature: f32,
+    pub max_tokens: u32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GenerateResponse {
+    pub content: String,
+    pub model: String,
+    pub input_tokens: u32,
+    pub output_tokens: u32,
+    pub duration_ms: u64,
+}
+
+// === SSE 事件 ===
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TokenUsage {
+    pub input: u32,
+    pub output: u32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type")]
+pub enum AnalysisSseEvent {
+    #[serde(rename = "chunk")]
+    Chunk { content: String, index: u32 },
+    #[serde(rename = "metadata")]
+    Metadata {
+        model: String,
+        tokens: TokenUsage,
+        duration_ms: u64,
+    },
+    #[serde(rename = "done")]
+    Done {
+        analysis_id: uuid::Uuid,
+        status: String,
+    },
+    #[serde(rename = "error")]
+    Error { message: String },
+}
diff --git a/crates/erp-ai/src/lib.rs b/crates/erp-ai/src/lib.rs
index e47f7c3..c4b3d26 100644
--- a/crates/erp-ai/src/lib.rs
+++ b/crates/erp-ai/src/lib.rs
@@ -1,4 +1,6 @@
+pub mod dto;
 pub mod entity;
 pub mod error;
+pub mod provider;
 
 pub use error::{AiError, AiResult};
diff --git a/crates/erp-ai/src/provider/claude.rs b/crates/erp-ai/src/provider/claude.rs
new file mode 100644
index 0000000..8b95707
--- /dev/null
+++ b/crates/erp-ai/src/provider/claude.rs
@@ -0,0 +1,227 @@
+use async_stream::stream;
+use async_trait::async_trait;
+use futures::{Stream, StreamExt};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+use std::pin::Pin;
+
+use super::AiProvider;
+use crate::dto::GenerateRequest;
+use crate::error::{AiError, AiResult};
+
+#[derive(Debug, Clone)]
+pub struct ClaudeProvider {
+    client: Client,
+    api_key: String,
+    base_url: String,
+}
+
+impl ClaudeProvider {
+    pub fn new(api_key: String) -> Self {
+        Self {
+            client: Client::new(),
+            api_key,
+            base_url: "https://api.anthropic.com".into(),
+        }
+    }
+
+    pub fn with_base_url(mut self, url: String) -> Self {
+        self.base_url = url;
+        self
+    }
+}
+
+#[derive(Serialize)]
+struct ClaudeRequest {
+    model: String,
+    max_tokens: u32,
+    temperature: f32,
+    system: String,
+    messages: Vec<ClaudeMessage>,
+    stream: bool,
+}
+
+#[derive(Serialize)]
+struct ClaudeMessage {
+    role: String,
+    content: String,
+}
+
+#[derive(Deserialize)]
+struct ClaudeStreamEvent {
+    #[serde(rename = "type")]
+    event_type: String,
+    delta: Option<ClaudeDelta>,
+    message: Option<ClaudeMessageResp>,
+}
+
+#[derive(Deserialize)]
+struct ClaudeDelta {
+    text: Option<String>,
+}
+
+#[derive(Deserialize)]
+struct ClaudeMessageResp {
+    usage: Option<ClaudeUsage>,
+}
+
+#[derive(Deserialize)]
+struct ClaudeUsage {
+    input_tokens: u32,
+    output_tokens: u32,
+}
+
+#[async_trait]
+impl AiProvider for ClaudeProvider {
+    async fn stream_generate(
+        &self,
+        req: GenerateRequest,
+    ) -> AiResult<Pin<Box<dyn Stream<Item = AiResult<String>> + Send>>> {
+        let claude_req = ClaudeRequest {
+            model: req.model,
+            max_tokens: req.max_tokens,
+            temperature: req.temperature,
+            system: req.system_prompt,
+            messages: vec![ClaudeMessage {
+                role: "user".into(),
+                content: req.user_prompt,
+            }],
+            stream: true,
+        };
+
+        let response = self
+            .client
+            .post(format!("{}/v1/messages", self.base_url))
+            .header("x-api-key", &self.api_key)
+            .header("anthropic-version", "2023-06-01")
+            .header("content-type", "application/json")
+            .json(&claude_req)
+            .send()
+            .await
+            .map_err(|e| AiError::ProviderError(format!("Claude API 请求失败: {e}")))?;
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let body = response.text().await.unwrap_or_default();
+            return Err(AiError::ProviderError(format!(
+                "Claude API 错误 {status}: {body}"
+            )));
+        }
+
+        let stream = Box::pin(stream! {
+            let mut stream = response.bytes_stream();
+            while let Some(chunk_result) = stream.next().await {
+                let bytes = match chunk_result {
+                    Ok(b) => b,
+                    Err(e) => {
+                        yield Err(AiError::ProviderError(format!("流读取错误: {e}")));
+                        break;
+                    }
+                };
+
+                let text = String::from_utf8_lossy(&bytes);
+                for line in text.lines() {
+                    if let Some(data) = line.strip_prefix("data: ") {
+                        if data == "[DONE]" {
+                            return;
+                        }
+                        if let Ok(event) = serde_json::from_str::<ClaudeStreamEvent>(data) {
+                            if event.event_type == "content_block_delta" {
+                                if let Some(delta) = event.delta {
+                                    if let Some(text) = delta.text {
+                                        yield Ok(text);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        });
+
+        Ok(stream)
+    }
+
+    async fn generate(&self, req: GenerateRequest) -> AiResult<crate::dto::GenerateResponse> {
+        let start = std::time::Instant::now();
+
+        let claude_req = ClaudeRequest {
+            model: req.model.clone(),
+            max_tokens: req.max_tokens,
+            temperature: req.temperature,
+            system: req.system_prompt,
+            messages: vec![ClaudeMessage {
+                role: "user".into(),
+                content: req.user_prompt,
+            }],
+            stream: false,
+        };
+
+        let resp = self
+            .client
+            .post(format!("{}/v1/messages", self.base_url))
+            .header("x-api-key", &self.api_key)
+            .header("anthropic-version", "2023-06-01")
+            .header("content-type", "application/json")
+            .json(&claude_req)
+            .send()
+            .await
+            .map_err(|e| AiError::ProviderError(e.to_string()))?;
+
+        let status = resp.status();
+        let body = resp
+            .text()
+            .await
+            .map_err(|e| AiError::ProviderError(e.to_string()))?;
+
+        if !status.is_success() {
+            return Err(AiError::ProviderError(format!(
+                "Claude {status}: {body}"
+            )));
+        }
+
+        let parsed: serde_json::Value = serde_json::from_str(&body)
+            .map_err(|e| AiError::ProviderError(format!("解析响应失败: {e}")))?;
+
+        let content = parsed["content"][0]["text"]
+            .as_str()
+            .unwrap_or("")
+            .to_string();
+
+        let input_tokens = parsed["usage"]["input_tokens"].as_u64().unwrap_or(0) as u32;
+        let output_tokens = parsed["usage"]["output_tokens"].as_u64().unwrap_or(0) as u32;
+
+        Ok(crate::dto::GenerateResponse {
+            content,
+            model: req.model,
+            input_tokens,
+            output_tokens,
+            duration_ms: start.elapsed().as_millis() as u64,
+        })
+    }
+
+    fn name(&self) -> &str {
+        "claude"
+    }
+
+    async fn health_check(&self) -> AiResult<bool> {
+        let resp = self
+            .client
+            .post(format!("{}/v1/messages", self.base_url))
+            .header("x-api-key", &self.api_key)
+            .header("anthropic-version", "2023-06-01")
+            .header("content-type", "application/json")
+            .json(&serde_json::json!({
+                "model": "claude-sonnet-4-6",
+                "max_tokens": 1,
+                "messages": [{"role": "user", "content": "hi"}]
+            }))
+            .send()
+            .await;
+
+        match resp {
+            Ok(r) => Ok(r.status().is_success() || r.status().as_u16() == 400),
+            Err(_) => Ok(false),
+        }
+    }
+}
diff --git a/crates/erp-ai/src/provider/mod.rs b/crates/erp-ai/src/provider/mod.rs
new file mode 100644
index 0000000..1f35e19
--- /dev/null
+++ b/crates/erp-ai/src/provider/mod.rs
@@ -0,0 +1,27 @@
+pub mod claude;
+
+use async_trait::async_trait;
+use futures::Stream;
+use std::pin::Pin;
+
+use crate::dto::GenerateRequest;
+use crate::error::AiResult;
+
+/// AI 提供商 trait
+#[async_trait]
+pub trait AiProvider: Send + Sync {
+    /// 流式生成
+    async fn stream_generate(
+        &self,
+        req: GenerateRequest,
+    ) -> AiResult<Pin<Box<dyn Stream<Item = AiResult<String>> + Send>>>;
+
+    /// 非流式生成
+    async fn generate(&self, req: GenerateRequest) -> AiResult<crate::dto::GenerateResponse>;
+
+    /// 提供商名称
+    fn name(&self) -> &str;
+
+    /// 健康检查
+    async fn health_check(&self) -> AiResult<bool>;
+}