diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e7d8cb..24a5666 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,7 @@ project(InvoDB)
 
 set(CMAKE_CXX_STANDARD 14)
 
+
 include_directories(.)
 include_directories(./invodb)
 
diff --git a/invodb/btree/btree_node.cpp b/invodb/btree/btree_node.cpp
index f90790e..f73cb59 100644
--- a/invodb/btree/btree_node.cpp
+++ b/invodb/btree/btree_node.cpp
@@ -11,6 +11,9 @@ NodeUUID *NodeUUID::getNode(const int &address) {
         delete map[address];
         map[address] = new NodeUUID(address);
     }
+//    if(map.count(address) == 0) {
+//        map[address] = new NodeUUID(address);
+//    }
     return map[address];
 }
 
diff --git a/invodb/btree/btree_node.h b/invodb/btree/btree_node.h
index d060a1b..534b375 100644
--- a/invodb/btree/btree_node.h
+++ b/invodb/btree/btree_node.h
@@ -29,7 +29,7 @@ public:
     void clear();
     void save();
     //static const int m = 27;
-    static const int m = 3;
+    static const int m = 27;
     static const int maxCount = m - 1;
     static const int minLeafCount = m / 2;
     static const int minLinkCount = (m - 1) / 2;
diff --git a/invodb/btree/btree_uuid.cpp b/invodb/btree/btree_uuid.cpp
index a1df79c..255ffa9 100644
--- a/invodb/btree/btree_uuid.cpp
+++ b/invodb/btree/btree_uuid.cpp
@@ -243,7 +243,7 @@ void BTreeUUID::remove(const std::string &uuid) {
 }
 
 void BTreeUUID::removeEntry(int curAddr, const std::string& uuid, const int& pointer) {
-    printf("---removeEntry: %d %s %d\n", curAddr, uuid.c_str(), pointer);
+    //printf("---removeEntry: %d %s %d\n", curAddr, uuid.c_str(), pointer);
 
     NodeUUID* cur = NodeUUID::getNode(curAddr);
     int pos = cur->findPos(uuid);
@@ -270,7 +270,7 @@ void BTreeUUID::removeEntry(int curAddr, const std::string& uuid, const int& poi
     if(cur->enough() || cur->address == root) return;
 
 
-    printf("em %d %d\n", cur->address, cur->size);
+    //printf("em %d %d\n", cur->address, cur->size);
 
 
     if(canCoalesce(cur->address, cur->left)) {
@@ -297,7 +297,7 @@ bool BTreeUUID::canCoalesce(int curAddr, int sibAddr) {
 
 void BTreeUUID::coalesce(int curAddr, int sibAddr) {
 
-    printf("coalesce %d and %d\n", curAddr, sibAddr);
+    //printf("coalesce %d and %d\n", curAddr, sibAddr);
 
     NodeUUID* cur = NodeUUID::getNode(curAddr);
     NodeUUID* sib = NodeUUID::getNode(sibAddr);
@@ -364,7 +364,7 @@ bool BTreeUUID::canRedistribute(int curAddr, int sibAddr) {
 
 void BTreeUUID::redistribute(int curAddr, int sibAddr) {
 
-    printf("redistribute %d from %d\n", curAddr, sibAddr);
+    //printf("redistribute %d from %d\n", curAddr, sibAddr);
 
     NodeUUID* cur = NodeUUID::getNode(curAddr);
     NodeUUID* sib = NodeUUID::getNode(sibAddr);
diff --git a/invodb/file/page_manager.h b/invodb/file/page_manager.h
index c90576f..859a3b1 100644
--- a/invodb/file/page_manager.h
+++ b/invodb/file/page_manager.h
@@ -7,6 +7,7 @@
 
 #include <iostream>
 #include <fstream>
+#include <map>
 
 #include "storage_page.h"
 
@@ -22,6 +23,7 @@ public:
     int allocate();
     void free(const int &index);
 private:
+    std::map<int, StoragePage> map;
     std::fstream stream;
     // 私有化实现单例
     PageManager() {}
diff --git a/invodb/file/storage_page.cpp b/invodb/file/storage_page.cpp
index 784dd2b..9dc3913 100644
--- a/invodb/file/storage_page.cpp
+++ b/invodb/file/storage_page.cpp
@@ -57,3 +57,7 @@ int StoragePage::getAddress() {
     return address;
 }
 
+StoragePage::StoragePage() {
+
+}
+
diff --git a/invodb/file/storage_page.h b/invodb/file/storage_page.h
index 90b902a..23a678f 100644
--- a/invodb/file/storage_page.h
+++ b/invodb/file/storage_page.h
@@ -13,6 +13,7 @@ class PageManager;
 
 class StoragePage {
 public:
+    StoragePage();
     void print();
     int next();
     void setNext(const int& nextPage);
diff --git a/invodb/main.cpp b/invodb/main.cpp
index c84521f..a03f179 100644
--- a/invodb/main.cpp
+++ b/invodb/main.cpp
@@ -11,7 +11,7 @@ void benchmark() {
 
     std::vector<std::pair<std::string, int>> v;
 
-    const int n = 1000000;
+    const int n = 100000;
 
     for(int i=0; i<n; i++) {
         generateUUID(uuid);
@@ -20,17 +20,29 @@ void benchmark() {
         btree->insert(uuid, addr);
     }
 
-    for(int i=0; i<1000000; i++) {
+    for(int i=0; i<100000; i++) {
         std::swap(v[rand()%v.size()], v[rand()%v.size()]);
     }
 
     for(int i=0; i<v.size(); i++) {
-        int addr = btree->find(v[0].first);
-        if(addr != v[0].second) {
+        int addr = btree->find(v[i].first);
+        if(addr != v[i].second) {
             printf("fuck\n");
             exit(0);
         }
     }
+
+    for(int i=0; i<v.size(); i++) {
+        if(i < v.size() / 2) {
+            btree->remove(v[i].first);
+        } else {
+            int addr = btree->find(v[i].first);
+            if(addr != v[i].second) {
+                printf("fuck\n");
+                exit(0);
+            }
+        }
+    }
 }
 
 int main() {
diff --git a/invodb/models/collection.cpp b/invodb/models/collection.cpp
index 7aa8a7d..f79274a 100644
--- a/invodb/models/collection.cpp
+++ b/invodb/models/collection.cpp
@@ -70,8 +70,6 @@ Collection& Collection::createCollection(const std::string &name) {
     page.print();
     page.save();
 
-
-
     Collection *col = new Collection(name, collectionPage);
 
     map.insert(make_pair(name, col));