diff --git a/index.cpp b/index.cpp
new file mode 100644
index 0000000..115978a
--- /dev/null
+++ b/index.cpp
@@ -0,0 +1,88 @@
+use anyhow::Result;
+use jieba_rs::Jieba;
+use std::path::Path;
+use tantivy::{
+    collector::TopDocs,
+    doc,
+    query::QueryParser,
+    schema::{Schema, STORED, TEXT},
+    Index, IndexWriter,
+};
+
+pub struct SearchEngine {
+    index: Index,
+    writer: IndexWriter,
+    jieba: Jieba,
+}
+
+impl SearchEngine {
+    pub fn new(index_path: &Path) -> Result<Self> {
+        let mut schema_builder = Schema::builder();
+        
+        // 定义索引结构
+        schema_builder.add_text_field("path", TEXT | STORED);
+        schema_builder.add_text_field("content", TEXT);
+        schema_builder.add_text_field("file_type", TEXT | STORED);
+        schema_builder.add_date_field("modified", STORED);
+        schema_builder.add_u64_field("size", STORED);
+        
+        let schema = schema_builder.build();
+        let index = Index::create_in_dir(index_path, schema)?;
+        let writer = index.writer(50_000_000)?; // 50MB buffer
+        
+        Ok(Self {
+            index,
+            writer,
+            jieba: Jieba::new(),
+        })
+    }
+
+    pub async fn add_document(&mut self, path: &Path, content: &str) -> Result<()> {
+        let schema = self.index.schema();
+        let path_field = schema.get_field("path").unwrap();
+        let content_field = schema.get_field("content").unwrap();
+
+        // 使用结巴分词处理内容
+        let tokens = self.jieba.cut_for_search(content);
+        
+        self.writer.add_document(doc!(
+            path_field => path.to_string_lossy().to_string(),
+            content_field => tokens.join(" ")
+        ))?;
+        
+        Ok(())
+    }
+
+    pub async fn search(&self, query: &str, limit: usize) -> Result<Vec<SearchResult>> {
+        let reader = self.index.reader()?;
+        let searcher = reader.searcher();
+        
+        let schema = self.index.schema();
+        let content_field = schema.get_field("content").unwrap();
+        
+        let query_parser = QueryParser::for_index(&self.index, vec![content_field]);
+        
+        // 处理布尔查询
+        let query = query_parser.parse_query(query)?;
+        let top_docs = searcher.search(&query, &TopDocs::with_limit(limit))?;
+        
+        let mut results = Vec::new();
+        for (_score, doc_address) in top_docs {
+            let doc = searcher.doc(doc_address)?;
+            results.push(SearchResult {
+                path: doc.get_first(schema.get_field("path").unwrap()).unwrap().text().unwrap().to_string(),
+                snippet: String::new(), // TODO: 实现片段提取
+                positions: vec![], // TODO: 实现位置信息
+            });
+        }
+        
+        Ok(results)
+    }
+}
+
+#[derive(Debug, serde::Serialize)]
+pub struct SearchResult {
+    pub path: String,
+    pub snippet: String,
+    pub positions: Vec<usize>,
+} 
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