diff --git a/src/table/record_header.cpp b/src/table/record_header.cpp
index e197c77..88c0ecb 100644
--- a/src/table/record_header.cpp
+++ b/src/table/record_header.cpp
@@ -2,6 +2,7 @@
 
 #include <cassert>
 #include <cstring>
+#include <sstream>
 
 namespace huadb {
 
@@ -33,4 +34,15 @@ db_size_t RecordHeader::DeserializeFrom(const char *data) {
   return offset;
 }
 
+std::string RecordHeader::ToString() const {
+  std::ostringstream oss;
+  oss << "Header[";
+  oss << "deleted: " << deleted_;
+  oss << ", xmin: " << xmin_;
+  oss << ", xmax: " << xmax_;
+  oss << ", cid: " << cid_;
+  oss << "]";
+  return oss.str();
+}
+
 }  // namespace huadb
diff --git a/src/table/record_header.h b/src/table/record_header.h
index 20a905a..32fa2c6 100644
--- a/src/table/record_header.h
+++ b/src/table/record_header.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <string>
+
 #include "common/constants.h"
 
 namespace huadb {
@@ -13,6 +15,8 @@ class RecordHeader {
   db_size_t SerializeTo(char *data) const;
   db_size_t DeserializeFrom(const char *data);
 
+  std::string ToString() const;
+
  private:
   // LAB 1: 记录是否删除
   bool deleted_ = false;
diff --git a/src/table/table_page.cpp b/src/table/table_page.cpp
index 25cff52..0acc2b4 100644
--- a/src/table/table_page.cpp
+++ b/src/table/table_page.cpp
@@ -105,9 +105,19 @@ std::string TablePage::ToString() const {
   oss << "  next_page_id: " << *next_page_id_ << std::endl;
   oss << "  lower: " << *lower_ << std::endl;
   oss << "  upper: " << *upper_ << std::endl;
+  if (*lower_ > *upper_) {
+    oss << "***Error: lower > upper***" << std::endl;
+  }
   oss << "  slots: " << std::endl;
   for (size_t i = 0; i < GetRecordCount(); i++) {
-    oss << "    " << i << ": offset " << slots_[i].offset_ << ", size " << slots_[i].size_ << std::endl;
+    oss << "    " << i << ": offset " << slots_[i].offset_ << ", size " << slots_[i].size_ << " ";
+    if (slots_[i].size_ <= RECORD_HEADER_SIZE) {
+      oss << "***Error: record size smaller than header size***" << std::endl;
+    } else {
+      RecordHeader header;
+      header.DeserializeFrom(page_data_ + slots_[i].offset_);
+      oss << header.ToString() << std::endl;
+    }
   }
   oss << "]\n";
   return oss.str();
diff --git a/test/lab1/10-insert.test b/test/lab1/10-insert.test
index b4fca4f..c5f8a28 100644
--- a/test/lab1/10-insert.test
+++ b/test/lab1/10-insert.test
@@ -28,6 +28,7 @@ select score, info from test_insert;
 5.5 eeeee
 6.6 ffffff
 
+# 新建页面
 query
 insert into test_insert values(7, 7.7, 'ggggggg'), (8, 8.8, 'hhhhhhhh'), (9, 9.9, 'iiiiiiiii'), (10, 10.1, 'jjjjjjjjjj'), (11, 11.1, 'kkkkkkkkkkk');
 ----