diff --git a/internal/bot/bot.go b/internal/bot/bot.go
index ebe6d8f..ceae387 100644
--- a/internal/bot/bot.go
+++ b/internal/bot/bot.go
@@ -2,7 +2,6 @@ package bot
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"github.com/openai/openai-go"
@@ -13,33 +12,66 @@ import (
 const maxHistory = 20
 
 type Bot struct {
-	client  *openai.Client
-	cfg     *config.Config
-	history []openai.ChatCompletionMessageParamUnion
+	clients      map[string]*openai.Client
+	cfg          *config.Config
+	provider     *config.Provider
+	model        string
+	history      []openai.ChatCompletionMessageParamUnion
+	systemPrompt string
 }
 
 func New(cfg *config.Config) *Bot {
-	client := openai.NewClient(
-		option.WithAPIKey(cfg.APIKey),
-		option.WithBaseURL(cfg.BaseURL),
-	)
-	return &Bot{
-		client: &client,
-		cfg:    cfg,
+	b := &Bot{
+		clients:      make(map[string]*openai.Client),
+		cfg:          cfg,
+		systemPrompt: cfg.SystemPrompt,
 	}
+	b.provider = config.FindProvider(cfg.DefaultProvider)
+	b.model = cfg.DefaultModel
+	return b
+}
+
+func (b *Bot) client() *openai.Client {
+	if c, ok := b.clients[b.provider.Name]; ok {
+		return c
+	}
+	c := openai.NewClient(
+		option.WithAPIKey(b.provider.APIKey),
+		option.WithBaseURL(b.provider.BaseURL),
+	)
+	b.clients[b.provider.Name] = &c
+	return &c
+}
+
+func (b *Bot) Models() []string {
+	return config.AllModels()
+}
+
+func (b *Bot) Current() (string, string) {
+	return b.provider.Name, b.model
+}
+
+func (b *Bot) SwitchModel(id string) error {
+	p, modelName, err := config.ResolveModel(id)
+	if err != nil {
+		return err
+	}
+	b.provider = p
+	b.model = modelName
+	return nil
 }
 
 func (b *Bot) Chat(ctx context.Context, userMsg string) (string, error) {
-	if b.cfg.APIKey == "" {
-		return "", errors.New("未配置 api_key，请编辑 data/config.yaml")
+	if b.provider.APIKey == "" {
+		return "", fmt.Errorf("供应商 %s 未配置 api_key，请编辑 data/config.yaml", b.provider.Name)
 	}
 	history := make([]openai.ChatCompletionMessageParamUnion, 0, len(b.history)+2)
-	history = append(history, openai.SystemMessage(b.cfg.SystemPrompt))
+	history = append(history, openai.SystemMessage(b.systemPrompt))
 	history = append(history, b.history...)
 	history = append(history, openai.UserMessage(userMsg))
 
-	stream := b.client.Chat.Completions.NewStreaming(ctx, openai.ChatCompletionNewParams{
-		Model:    b.cfg.Model,
+	stream := b.client().Chat.Completions.NewStreaming(ctx, openai.ChatCompletionNewParams{
+		Model:    b.model,
 		Messages: history,
 	})
 	answer := ""
diff --git a/internal/config/config.go b/internal/config/config.go
index c8632db..373d6e5 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -1,8 +1,11 @@
 package config
 
 import (
+	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"gopkg.in/yaml.v3"
 )
@@ -12,14 +15,27 @@ const (
 	configFile = "config.yaml"
 )
 
+type Provider struct {
+	Name    string   `yaml:"name"`
+	APIKey  string   `yaml:"api_key"`
+	BaseURL string   `yaml:"base_url"`
+	Models  []string `yaml:"models"`
+}
+
 type Config struct {
-	BotName      string `yaml:"bot_name"`
-	Port         int    `yaml:"port"`
-	LogLevel     string `yaml:"log_level"`
-	APIKey       string `yaml:"api_key"`
-	BaseURL      string `yaml:"base_url"`
-	Model        string `yaml:"model"`
-	SystemPrompt string `yaml:"system_prompt"`
+	BotName         string     `yaml:"bot_name"`
+	Port            int        `yaml:"port"`
+	LogLevel        string     `yaml:"log_level"`
+	SystemPrompt    string     `yaml:"system_prompt"`
+	Providers       []Provider `yaml:"providers"`
+	DefaultProvider string     `yaml:"default_provider"`
+	DefaultModel    string     `yaml:"default_model"`
+}
+
+type legacyConfig struct {
+	APIKey  string `yaml:"api_key"`
+	BaseURL string `yaml:"base_url"`
+	Model   string `yaml:"model"`
 }
 
 var cfg *Config
@@ -45,54 +61,190 @@ func Load() (*Config, error) {
 	if err := yaml.Unmarshal(data, cfg); err != nil {
 		return nil, err
 	}
+	if len(cfg.Providers) == 0 {
+		if err := migrateLegacy(path, data); err != nil {
+			return nil, err
+		}
+	}
 	applyDefaults(cfg)
+	if err := validate(cfg); err != nil {
+		return nil, err
+	}
 	return cfg, nil
 }
 
-func applyDefaults(c *Config) {
-	def := &Config{
-		BotName:      "ai-bot",
-		Port:         8080,
-		LogLevel:     "info",
-		BaseURL:      "https://api.openai.com/v1",
-		Model:        "gpt-4o-mini",
-		SystemPrompt: "你是一个乐于助人的 AI 助手。",
-	}
-	if c.BotName == "" {
-		c.BotName = def.BotName
-	}
-	if c.Port == 0 {
-		c.Port = def.Port
-	}
-	if c.LogLevel == "" {
-		c.LogLevel = def.LogLevel
-	}
-	if c.BaseURL == "" {
-		c.BaseURL = def.BaseURL
-	}
-	if c.Model == "" {
-		c.Model = def.Model
-	}
-	if c.SystemPrompt == "" {
-		c.SystemPrompt = def.SystemPrompt
-	}
-}
-
 func GetConfig() *Config {
 	return cfg
 }
 
+func migrateLegacy(path string, data []byte) error {
+	legacy := &legacyConfig{}
+	if err := yaml.Unmarshal(data, legacy); err != nil {
+		return err
+	}
+	if legacy.APIKey == "" && legacy.BaseURL == "" && legacy.Model == "" {
+		return errors.New("配置文件中没有 providers，请检查 data/config.yaml")
+	}
+	p := Provider{
+		Name:    "openai",
+		APIKey:  legacy.APIKey,
+		BaseURL: legacy.BaseURL,
+		Models:  []string{legacy.Model},
+	}
+	if p.BaseURL == "" {
+		p.BaseURL = "https://api.openai.com/v1"
+	}
+	if len(p.Models) == 0 || p.Models[0] == "" {
+		p.Models = []string{"gpt-4o-mini"}
+	}
+	cfg.Providers = []Provider{p}
+	cfg.DefaultProvider = p.Name
+	cfg.DefaultModel = p.Models[0]
+	return writeFile(path, cfg)
+}
+
+func applyDefaults(c *Config) {
+	if c.BotName == "" {
+		c.BotName = "ai-bot"
+	}
+	if c.Port == 0 {
+		c.Port = 8080
+	}
+	if c.LogLevel == "" {
+		c.LogLevel = "info"
+	}
+	if c.SystemPrompt == "" {
+		c.SystemPrompt = "你是一个乐于助人的 AI 助手。"
+	}
+	if c.DefaultProvider == "" && len(c.Providers) > 0 {
+		c.DefaultProvider = c.Providers[0].Name
+	}
+}
+
+func validate(c *Config) error {
+	if len(c.Providers) == 0 {
+		return errors.New("至少需要一个供应商 (providers)")
+	}
+	names := make(map[string]bool, len(c.Providers))
+	for i := range c.Providers {
+		p := &c.Providers[i]
+		if p.Name == "" {
+			return fmt.Errorf("providers[%d] 缺少 name", i)
+		}
+		if names[p.Name] {
+			return fmt.Errorf("供应商名称重复: %s", p.Name)
+		}
+		names[p.Name] = true
+		if p.BaseURL == "" {
+			return fmt.Errorf("供应商 %s 缺少 base_url", p.Name)
+		}
+		if len(p.Models) == 0 {
+			return fmt.Errorf("供应商 %s 未配置 models", p.Name)
+		}
+		for _, m := range p.Models {
+			if m == "" {
+				return fmt.Errorf("供应商 %s 包含空模型名", p.Name)
+			}
+		}
+	}
+	if _, ok := names[c.DefaultProvider]; !ok {
+		return fmt.Errorf("default_provider %q 不存在", c.DefaultProvider)
+	}
+	if _, _, err := ResolveModel(c.DefaultModel); err != nil {
+		return fmt.Errorf("default_model 无效: %w", err)
+	}
+	return nil
+}
+
+func FindProvider(name string) *Provider {
+	for i := range cfg.Providers {
+		if cfg.Providers[i].Name == name {
+			return &cfg.Providers[i]
+		}
+	}
+	return nil
+}
+
+func ResolveModel(id string) (*Provider, string, error) {
+	if id == "" {
+		id = cfg.DefaultModel
+	}
+	if providerName, modelName, ok := strings.Cut(id, "/"); ok {
+		p := FindProvider(providerName)
+		if p == nil {
+			return nil, "", fmt.Errorf("供应商 %q 不存在", providerName)
+		}
+		if !contains(p.Models, modelName) {
+			return nil, "", fmt.Errorf("供应商 %s 没有模型 %q", p.Name, modelName)
+		}
+		return p, modelName, nil
+	}
+	var found *Provider
+	for i := range cfg.Providers {
+		if contains(cfg.Providers[i].Models, id) {
+			if found != nil {
+				return nil, "", fmt.Errorf("模型 %q 在多个供应商中存在，请使用 provider/model 格式指定", id)
+			}
+			found = &cfg.Providers[i]
+		}
+	}
+	if found == nil {
+		return nil, "", fmt.Errorf("模型 %q 不存在", id)
+	}
+	return found, id, nil
+}
+
+func AllModels() []string {
+	var out []string
+	for i := range cfg.Providers {
+		p := &cfg.Providers[i]
+		for _, m := range p.Models {
+			out = append(out, p.Name+"/"+m)
+		}
+	}
+	return out
+}
+
+func contains(list []string, s string) bool {
+	for _, v := range list {
+		if v == s {
+			return true
+		}
+	}
+	return false
+}
+
 func writeDefault(path string) error {
 	cfg = &Config{
 		BotName:      "ai-bot",
 		Port:         8080,
 		LogLevel:     "info",
-		APIKey:       "",
-		BaseURL:      "https://api.openai.com/v1",
-		Model:        "gpt-4o-mini",
 		SystemPrompt: "你是一个乐于助人的 AI 助手。",
+		Providers: []Provider{
+			{
+				Name:    "openai",
+				APIKey:  "",
+				BaseURL: "https://api.openai.com/v1",
+				Models:  []string{"gpt-4o-mini", "gpt-4o"},
+			},
+			{
+				Name:    "deepseek",
+				APIKey:  "",
+				BaseURL: "https://api.deepseek.com/v1",
+				Models:  []string{"deepseek-chat", "deepseek-reasoner"},
+			},
+		},
+		DefaultProvider: "openai",
+		DefaultModel:    "gpt-4o-mini",
 	}
-	data, err := yaml.Marshal(cfg)
+	if err := validate(cfg); err != nil {
+		return err
+	}
+	return writeFile(path, cfg)
+}
+
+func writeFile(path string, c *Config) error {
+	data, err := yaml.Marshal(c)
 	if err != nil {
 		return err
 	}
diff --git a/main.go b/main.go
index 0284ca1..0709e41 100644
--- a/main.go
+++ b/main.go
@@ -17,12 +17,11 @@ func main() {
 	if err != nil {
 		log.Fatalf("加载配置失败: %v", err)
 	}
-	if cfg.APIKey == "" {
-		log.Println("提示: 未配置 api_key，请编辑 data/config.yaml")
-	}
-	fmt.Printf("🤖 %s 已启动 (模型: %s)。输入问题开始对话，输入 /exit 退出。\n", cfg.BotName, cfg.Model)
-
 	b := bot.New(cfg)
+	provider, model := b.Current()
+	fmt.Printf("🤖 %s 已启动 (供应商: %s, 模型: %s)。输入问题开始对话，输入 /help 查看命令。\n",
+		cfg.BotName, provider, model)
+
 	scanner := bufio.NewScanner(os.Stdin)
 	for {
 		fmt.Print("你: ")
@@ -33,9 +32,11 @@ func main() {
 		if input == "" {
 			continue
 		}
-		if input == "/exit" || input == "/quit" {
-			fmt.Println("再见！")
-			break
+		if strings.HasPrefix(input, "/") {
+			if !handleCommand(b, input) {
+				break
+			}
+			continue
 		}
 		answer, err := b.Chat(context.Background(), input)
 		if err != nil {
@@ -48,3 +49,40 @@ func main() {
 		log.Fatal(err)
 	}
 }
+
+func handleCommand(b *bot.Bot, input string) bool {
+	fields := strings.Fields(input)
+	cmd, args := fields[0], fields[1:]
+	switch cmd {
+	case "/exit", "/quit":
+		fmt.Println("再见！")
+		return false
+	case "/help":
+		fmt.Println("命令列表:")
+		fmt.Println("  /models            列出所有供应商和模型")
+		fmt.Println("  /use <模型>        切换模型，如 /use deepseek-chat 或 /use deepseek/deepseek-chat")
+		fmt.Println("  /info              显示当前供应商和模型")
+		fmt.Println("  /exit              退出")
+	case "/models":
+		for _, m := range b.Models() {
+			fmt.Println("  " + m)
+		}
+	case "/use":
+		if len(args) == 0 {
+			fmt.Println("用法: /use <模型>，如 /use deepseek-chat")
+			return true
+		}
+		if err := b.SwitchModel(args[0]); err != nil {
+			fmt.Printf("⚠️  %v\n", err)
+			return true
+		}
+		provider, model := b.Current()
+		fmt.Printf("已切换到 %s/%s (对话历史已保留)\n", provider, model)
+	case "/info":
+		provider, model := b.Current()
+		fmt.Printf("供应商: %s, 模型: %s\n", provider, model)
+	default:
+		fmt.Printf("未知命令: %s，输入 /help 查看命令列表\n", cmd)
+	}
+	return true
+}