diff --git a/module-mdm/src/main/java/com/ether/pms/mdm/service/SparePartService.java b/module-mdm/src/main/java/com/ether/pms/mdm/service/SparePartService.java
new file mode 100644
index 0000000..77c366b
--- /dev/null
+++ b/module-mdm/src/main/java/com/ether/pms/mdm/service/SparePartService.java
@@ -0,0 +1,27 @@
+package com.ether.pms.mdm.service;
+
+import com.ether.pms.mdm.entity.SparePart;
+import com.ether.pms.mdm.entity.SparePartCategory;
+import com.ether.pms.mdm.entity.SparePartRecord;
+import java.util.List;
+import java.util.UUID;
+
+public interface SparePartService {
+    // 分类管理
+    List<SparePartCategory> getCategories();
+    SparePartCategory createCategory(SparePartCategory category);
+
+    // 备件管理
+    SparePart createSparePart(SparePart sparePart);
+    SparePart updateSparePart(UUID id, SparePart sparePart);
+    void deleteSparePart(UUID id);
+    SparePart getSparePartById(UUID id);
+    List<SparePart> getSparePartsByProject(UUID projectId);
+    List<SparePart> getSparePartsByCategory(UUID categoryId);
+    List<SparePart> getLowStockParts(UUID projectId);
+
+    // 库存管理
+    SparePartRecord inStock(UUID sparePartId, Integer quantity, UUID recordedBy, String remarks);
+    SparePartRecord outStock(UUID sparePartId, Integer quantity, UUID relatedOrderId, UUID recordedBy, String remarks);
+    List<SparePartRecord> getSparePartRecords(UUID sparePartId);
+}
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diff --git a/module-mdm/src/main/java/com/ether/pms/mdm/service/impl/SparePartServiceImpl.java b/module-mdm/src/main/java/com/ether/pms/mdm/service/impl/SparePartServiceImpl.java
new file mode 100644
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--- /dev/null
+++ b/module-mdm/src/main/java/com/ether/pms/mdm/service/impl/SparePartServiceImpl.java
@@ -0,0 +1,270 @@
+package com.ether.pms.mdm.service.impl;
+
+import com.ether.pms.common.BusinessException;
+import com.ether.pms.mdm.entity.SparePart;
+import com.ether.pms.mdm.entity.SparePartCategory;
+import com.ether.pms.mdm.entity.SparePartRecord;
+import com.ether.pms.mdm.repository.SparePartCategoryRepository;
+import com.ether.pms.mdm.repository.SparePartRecordRepository;
+import com.ether.pms.mdm.repository.SparePartRepository;
+import com.ether.pms.mdm.service.SparePartService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.List;
+import java.util.UUID;
+
+@Service
+@RequiredArgsConstructor
+public class SparePartServiceImpl implements SparePartService {
+
+    private final SparePartRepository sparePartRepository;
+    private final SparePartCategoryRepository sparePartCategoryRepository;
+    private final SparePartRecordRepository sparePartRecordRepository;
+
+    private static final DateTimeFormatter CODE_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
+
+    // ==================== 分类管理 ====================
+
+    @Override
+    public List<SparePartCategory> getCategories() {
+        return sparePartCategoryRepository.findAll();
+    }
+
+    @Override
+    @Transactional
+    public SparePartCategory createCategory(SparePartCategory category) {
+        // 生成分类编码 CC + 时间戳
+        String categoryCode = generateCategoryCode();
+        category.setCategoryCode(categoryCode);
+        return sparePartCategoryRepository.save(category);
+    }
+
+    // ==================== 备件管理 ====================
+
+    @Override
+    @Transactional
+    public SparePart createSparePart(SparePart sparePart) {
+        // 生成备件编码 SP + 时间戳
+        String sparePartCode = generateSparePartCode();
+        sparePart.setSparePartCode(sparePartCode);
+
+        // 设置默认状态为ACTIVE
+        if (sparePart.getStatus() == null) {
+            sparePart.setStatus(SparePart.Status.ACTIVE);
+        }
+
+        // 初始化库存为0
+        if (sparePart.getCurrentStock() == null) {
+            sparePart.setCurrentStock(0);
+        }
+
+        return sparePartRepository.save(sparePart);
+    }
+
+    @Override
+    @Transactional
+    public SparePart updateSparePart(UUID id, SparePart sparePart) {
+        SparePart existing = getSparePartById(id);
+
+        if (sparePart.getSparePartName() != null) {
+            existing.setSparePartName(sparePart.getSparePartName());
+        }
+        if (sparePart.getCategoryId() != null) {
+            existing.setCategoryId(sparePart.getCategoryId());
+        }
+        if (sparePart.getSpecification() != null) {
+            existing.setSpecification(sparePart.getSpecification());
+        }
+        if (sparePart.getUnit() != null) {
+            existing.setUnit(sparePart.getUnit());
+        }
+        if (sparePart.getSafeStock() != null) {
+            existing.setSafeStock(sparePart.getSafeStock());
+        }
+        if (sparePart.getUnitPrice() != null) {
+            existing.setUnitPrice(sparePart.getUnitPrice());
+        }
+        if (sparePart.getSupplier() != null) {
+            existing.setSupplier(sparePart.getSupplier());
+        }
+        if (sparePart.getSupplierContact() != null) {
+            existing.setSupplierContact(sparePart.getSupplierContact());
+        }
+        if (sparePart.getLocation() != null) {
+            existing.setLocation(sparePart.getLocation());
+        }
+        if (sparePart.getRemarks() != null) {
+            existing.setRemarks(sparePart.getRemarks());
+        }
+        if (sparePart.getStatus() != null) {
+            existing.setStatus(sparePart.getStatus());
+        }
+
+        return sparePartRepository.save(existing);
+    }
+
+    @Override
+    @Transactional
+    public void deleteSparePart(UUID id) {
+        SparePart sparePart = getSparePartById(id);
+        sparePart.setStatus(SparePart.Status.INACTIVE);
+        sparePartRepository.save(sparePart);
+    }
+
+    @Override
+    public SparePart getSparePartById(UUID id) {
+        return sparePartRepository.findById(id)
+                .orElseThrow(() -> new BusinessException(6101, "备件不存在"));
+    }
+
+    @Override
+    public List<SparePart> getSparePartsByProject(UUID projectId) {
+        return sparePartRepository.findByProjectIdAndStatus(projectId, SparePart.Status.ACTIVE);
+    }
+
+    @Override
+    public List<SparePart> getSparePartsByCategory(UUID categoryId) {
+        return sparePartRepository.findByCategoryId(categoryId);
+    }
+
+    @Override
+    public List<SparePart> getLowStockParts(UUID projectId) {
+        return sparePartRepository.findLowStockParts(projectId);
+    }
+
+    // ==================== 库存管理 ====================
+
+    @Override
+    @Transactional
+    public SparePartRecord inStock(UUID sparePartId, Integer quantity, UUID recordedBy, String remarks) {
+        if (quantity == null || quantity <= 0) {
+            throw new BusinessException(6102, "入库数量必须大于0");
+        }
+
+        SparePart sparePart = getSparePartById(sparePartId);
+
+        // 更新库存
+        sparePart.setCurrentStock(sparePart.getCurrentStock() + quantity);
+        sparePartRepository.save(sparePart);
+
+        // 创建入库记录
+        return createSparePartRecord(sparePartId, SparePartRecord.RecordType.IN, quantity, recordedBy, remarks);
+    }
+
+    @Override
+    @Transactional
+    public SparePartRecord outStock(UUID sparePartId, Integer quantity, UUID relatedOrderId, UUID recordedBy, String remarks) {
+        if (quantity == null || quantity <= 0) {
+            throw new BusinessException(6103, "出库数量必须大于0");
+        }
+
+        SparePart sparePart = getSparePartById(sparePartId);
+
+        // 校验库存是否充足
+        if (sparePart.getCurrentStock() < quantity) {
+            throw new BusinessException(6104, "库存不足，当前库存：" + sparePart.getCurrentStock() + "，需要出库：" + quantity);
+        }
+
+        // 更新库存
+        sparePart.setCurrentStock(sparePart.getCurrentStock() - quantity);
+        sparePartRepository.save(sparePart);
+
+        // 创建出库记录
+        return createSparePartRecordWithOrder(sparePartId, SparePartRecord.RecordType.OUT, quantity, relatedOrderId, recordedBy, remarks);
+    }
+
+    @Override
+    public List<SparePartRecord> getSparePartRecords(UUID sparePartId) {
+        return sparePartRecordRepository.findBySparePartIdOrderByRecordDateDesc(sparePartId);
+    }
+
+    // ==================== 私有方法 ====================
+
+    /**
+     * 生成备件编码：SP + yyyyMMddHHmmss
+     */
+    private String generateSparePartCode() {
+        String timestamp = LocalDateTime.now().format(CODE_FORMATTER);
+        String sparePartCode = "SP" + timestamp;
+
+        // 确保编码唯一
+        int suffix = 1;
+        while (sparePartRepository.existsBySparePartCode(sparePartCode)) {
+            sparePartCode = "SP" + timestamp + "_" + suffix;
+            suffix++;
+        }
+
+        return sparePartCode;
+    }
+
+    /**
+     * 生成分类编码：CC + yyyyMMddHHmmss
+     */
+    private String generateCategoryCode() {
+        String timestamp = LocalDateTime.now().format(CODE_FORMATTER);
+        String categoryCode = "CC" + timestamp;
+
+        // 检查编码是否存在
+        int suffix = 1;
+        while (sparePartCategoryRepository.findByCategoryCode(categoryCode).isPresent()) {
+            categoryCode = "CC" + timestamp + "_" + suffix;
+            suffix++;
+        }
+
+        return categoryCode;
+    }
+
+    /**
+     * 创建库存记录
+     */
+    private SparePartRecord createSparePartRecord(UUID sparePartId, SparePartRecord.RecordType recordType,
+                                                    Integer quantity, UUID recordedBy, String remarks) {
+        SparePart sparePart = getSparePartById(sparePartId);
+
+        SparePartRecord record = new SparePartRecord();
+        record.setRecordCode(generateRecordCode(recordType));
+        record.setRecordType(recordType);
+        record.setSparePartId(sparePartId);
+        record.setQuantity(quantity);
+        record.setBalance(sparePart.getCurrentStock());
+        record.setRecordedBy(recordedBy);
+        record.setRemarks(remarks);
+        record.setRecordDate(LocalDateTime.now());
+
+        return sparePartRecordRepository.save(record);
+    }
+
+    /**
+     * 创建带订单信息的库存记录
+     */
+    private SparePartRecord createSparePartRecordWithOrder(UUID sparePartId, SparePartRecord.RecordType recordType,
+                                                             Integer quantity, UUID relatedOrderId, UUID recordedBy, String remarks) {
+        SparePart sparePart = getSparePartById(sparePartId);
+
+        SparePartRecord record = new SparePartRecord();
+        record.setRecordCode(generateRecordCode(recordType));
+        record.setRecordType(recordType);
+        record.setSparePartId(sparePartId);
+        record.setQuantity(quantity);
+        record.setBalance(sparePart.getCurrentStock());
+        record.setRelatedOrderId(relatedOrderId);
+        record.setRecordedBy(recordedBy);
+        record.setRemarks(remarks);
+        record.setRecordDate(LocalDateTime.now());
+
+        return sparePartRecordRepository.save(record);
+    }
+
+    /**
+     * 生成记录编码：REC + 类型 + 时间戳
+     */
+    private String generateRecordCode(SparePartRecord.RecordType recordType) {
+        String typeCode = recordType.name();
+        String timestamp = LocalDateTime.now().format(CODE_FORMATTER);
+        return "REC" + typeCode + timestamp;
+    }
+}
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