diff --git a/apps/desktop/src-tauri/src/business/services/material_matching_service.rs b/apps/desktop/src-tauri/src/business/services/material_matching_service.rs
index 95ca955..4f0d940 100644
--- a/apps/desktop/src-tauri/src/business/services/material_matching_service.rs
+++ b/apps/desktop/src-tauri/src/business/services/material_matching_service.rs
@@ -518,6 +518,13 @@ impl MaterialMatchingService {
         // 计算目标时长（微秒转秒）- 修复单位转换
         let target_duration = track_segment.duration as f64 / 1_000_000.0;
 
+        println!("🕐 时长转换日志 - AI分类匹配:");
+        println!("  轨道片段ID: {}", track_segment.id);
+        println!("  轨道片段名称: {}", track_segment.name);
+        println!("  原始时长(微秒): {}", track_segment.duration);
+        println!("  转换后时长(秒): {:.3}", target_duration);
+        println!("  目标分类: {}", target_category);
+
         // 过滤出匹配分类的片段
         let category_segments: Vec<_> = available_segments
             .iter()
@@ -588,6 +595,12 @@ impl MaterialMatchingService {
         // 计算目标时长（微秒转秒）- 修复单位转换
         let target_duration = track_segment.duration as f64 / 1_000_000.0;
 
+        println!("🕐 时长转换日志 - 随机匹配:");
+        println!("  轨道片段ID: {}", track_segment.id);
+        println!("  轨道片段名称: {}", track_segment.name);
+        println!("  原始时长(微秒): {}", track_segment.duration);
+        println!("  转换后时长(秒): {:.3}", target_duration);
+
         // 过滤出未使用的片段
         let unused_segments: Vec<_> = available_segments
             .iter()
@@ -643,16 +656,42 @@ impl MaterialMatchingService {
         let mut best_match = None;
         let mut best_score = 0.0;
 
-        for (segment, category, material) in segments {
-            if segment.meets_duration_requirement(target_duration) {
-                let score = segment.duration_match_score(target_duration);
+        println!("🔍 开始寻找最佳时长匹配:");
+        println!("  目标时长(秒): {:.3}", target_duration);
+        println!("  可选片段数量: {}", segments.len());
+
+        for (i, (segment, category, material)) in segments.iter().enumerate() {
+            let meets_requirement = segment.meets_duration_requirement(target_duration);
+            let score = segment.duration_match_score(target_duration);
+
+            println!("  片段{}: {} ({})", i + 1, segment.id, material.name);
+            println!("    素材片段时长(秒): {:.3}", segment.duration);
+            println!("    满足时长要求: {}", meets_requirement);
+            println!("    匹配评分: {:.3}", score);
+            println!("    分类: {}", category);
+
+            if meets_requirement {
                 if score > best_score {
                     best_score = score;
                     best_match = Some((*segment, *category, *material));
+                    println!("    ✅ 新的最佳匹配!");
                 }
+            } else {
+                println!("    ❌ 时长不足，跳过");
             }
         }
 
+        if let Some((best_segment, best_category, best_material)) = &best_match {
+            println!("🎯 最终选择:");
+            println!("  片段ID: {}", best_segment.id);
+            println!("  素材名称: {}", best_material.name);
+            println!("  片段时长(秒): {:.3}", best_segment.duration);
+            println!("  最佳评分: {:.3}", best_score);
+            println!("  分类: {}", best_category);
+        } else {
+            println!("❌ 未找到满足时长要求的片段");
+        }
+
         best_match
     }
 
diff --git a/apps/desktop/src-tauri/src/data/models/material.rs b/apps/desktop/src-tauri/src/data/models/material.rs
index f019ab0..92aee13 100644
--- a/apps/desktop/src-tauri/src/data/models/material.rs
+++ b/apps/desktop/src-tauri/src/data/models/material.rs
@@ -382,23 +382,32 @@ impl MaterialSegment {
 
     /// 检查片段是否满足最小时长要求
     pub fn meets_duration_requirement(&self, required_duration: f64) -> bool {
-        self.duration >= required_duration
+        let meets = self.duration >= required_duration;
+        println!("    📏 时长要求检查: 素材{:.3}s >= 要求{:.3}s = {}",
+                 self.duration, required_duration, meets);
+        meets
     }
 
     /// 计算与目标时长的匹配度（越接近越好，返回0.0-1.0）
     pub fn duration_match_score(&self, target_duration: f64) -> f64 {
         if self.duration < target_duration {
+            println!("    📊 匹配评分: 素材{:.3}s < 目标{:.3}s，时长不足 = 0.0",
+                     self.duration, target_duration);
             return 0.0; // 时长不足，不匹配
         }
 
         // 计算匹配度：时长越接近目标时长，分数越高
         let excess_ratio = (self.duration - target_duration) / target_duration;
-        if excess_ratio <= 0.1 {
+        let score = if excess_ratio <= 0.1 {
             1.0 // 超出10%以内，完美匹配
         } else if excess_ratio <= 0.5 {
             0.8 - (excess_ratio - 0.1) * 2.0 // 超出10%-50%，线性递减
         } else {
             0.3 // 超出50%以上，低匹配度
-        }
+        };
+
+        println!("    📊 匹配评分: 素材{:.3}s vs 目标{:.3}s，超出比例{:.1}% = {:.3}",
+                 self.duration, target_duration, excess_ratio * 100.0, score);
+        score
     }
 }