diff --git a/main/src/Data/FAT.java b/main/src/Data/FAT.java
index 1fc362b0e0ef85c9451b2b41e4bc9252eb39de96..ef79cbcf12e50fe11e25002c4f10c2f8a8d829e6 100644
--- a/main/src/Data/FAT.java
+++ b/main/src/Data/FAT.java
@@ -31,6 +31,7 @@ public class FAT implements Serializable {
             }
         }
        int needNum = file.getNeed();
+        System.out.println("needNum:" + needNum);
         if(needNum <= sum){
             return true;
         }else {
@@ -38,10 +39,6 @@ public class FAT implements Serializable {
         }
     }
     public void applySpace(File file){
-        if(!judge(file)){
-            System.out.println("磁盘空间不足");
-            return;
-        }
         int neededDiskNum = file.getLength();
         int record = neededDiskNum ;
         int previous = 0;
diff --git a/main/src/Data/File.java b/main/src/Data/File.java
index b1fe257f39d159561b24855bfaf282f47a97ec66..2353fc662df11f1fbfbae8c11bfa514aee36986e 100644
--- a/main/src/Data/File.java
+++ b/main/src/Data/File.java
@@ -110,8 +110,7 @@ public class File implements Serializable {
     }
 
     public int getLength() {
-        getSize();
-        length = content.length()/64;
+        length = (content.length())/64;
         if(content.length()%64 != 0){
             length += 1;
         }
@@ -259,7 +258,8 @@ public class File implements Serializable {
     }
 
     public int getNeed(){
-        return length - getLength();
+        int frontLength = length;
+        return getLength() - frontLength;
     }
 
 
diff --git a/main/src/controller/FileController.java b/main/src/controller/FileController.java
index 53b2bb819260d087553a3bf03f789e2254c13d1c..790684095a4a3c2f4f2d6e47192491b08248d60e 100644
--- a/main/src/controller/FileController.java
+++ b/main/src/controller/FileController.java
@@ -3,6 +3,7 @@ package controller;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.chart.PieChart;
+import javafx.scene.control.Alert;
 import javafx.scene.control.Button;
 import javafx.scene.control.TextArea;
 import javafx.scene.control.ToolBar;
@@ -45,9 +46,24 @@ public class FileController {
     @FXML
     void saveContent(ActionEvent event) throws IOException, ClassNotFoundException {
         if (currentFile.isReadOnly()) {
-            saveItem.setDisable(true);
+            contentField.setDisable(true);
         } else {
+            String front = currentFile.getContent();
             currentFile.setContent(contentField.getText());
+            if(!fat.judge(currentFile)){
+                currentFile.setContent(front);
+                Alert alert = new Alert(Alert.AlertType.WARNING);
+                alert.setContentText("磁盘空间不足");
+                alert.show();
+                if (currentFile.getParent() == rootFile) {
+                    currentFile = rootFile;
+                } else {
+                    currentFile = currentFile.getParent();
+                }
+                Stage stage = (Stage) contentField.getScene().getWindow();
+                stage.close();
+                return;
+            }
             fat.applySpace(currentFile);
             if (currentFile.getParent() == rootFile) {
                 currentFile = rootFile;
@@ -59,6 +75,7 @@ public class FileController {
             UpdatePieChart.updatePieChart(diskChart);
             writeDisk();
         }
+        currentFile.setOpen(false);
     }
 
     public static void setDiskChart(PieChart Chart){
diff --git a/main/src/controller/MainController.java b/main/src/controller/MainController.java
index 7d95a74316061e6260096e276937ea300b0f63b6..dc9b38b5b9aee3226203498596ab225559d55e8b 100644
--- a/main/src/controller/MainController.java
+++ b/main/src/controller/MainController.java
@@ -320,6 +320,18 @@ public class MainController {
 //新建文件
     public void menuItemAction(){
         createFileItem.setOnAction(ActionEvent -> {
+            int sum = 0;
+            for(int i = 2; i < 128; i++){
+                if(fat.getDiskBlocks()[i].getNextDiskNum() == 0){
+                    sum++;
+                }
+            }
+            if(sum == 0){
+                Alert alert = new Alert(Alert.AlertType.WARNING);
+                alert.setContentText("磁盘空间不足");
+                alert.show();
+                return;
+            }
             File file = createFileOperations.createFile(fileExplorer,icons,actionContextMenu);
             TreeViewIterator treeViewIterator = new TreeViewIterator();
             treeViewIterator.Clear();
@@ -335,6 +347,18 @@ public class MainController {
         });
 
         createFolderItem.setOnAction(ActionEvent -> {
+            int sum = 0;
+            for(int i = 2; i < 128; i++){
+                if(fat.getDiskBlocks()[i].getNextDiskNum() == 0){
+                    sum++;
+                }
+            }
+            if(sum == 0){
+                Alert alert = new Alert(Alert.AlertType.WARNING);
+                alert.setContentText("磁盘空间不足");
+                alert.show();
+                return;
+            }
             File folder = createFileOperations.createFolder(fileExplorer,icons,actionContextMenu);
             TreeViewIterator treeViewIterator = new TreeViewIterator();
             treeViewIterator.Clear();
@@ -396,10 +420,18 @@ public class MainController {
                     actionContextMenu.getItems().get(0).setOnAction(ActionEvent -> {
                         currentFile = FindLabelToFile.findFile(icons, src);
                         if(currentFile != null) {
+
                             if (currentFile.isFolder()) {
                                 openOperations.openFolder(fileExplorer, currentFile, icons);
                             } else {
+                                if(currentFile.isOpen()){
+                                    Alert alert = new Alert(Alert.AlertType.WARNING);
+                                    alert.setContentText("文件已打开!");
+                                    alert.show();
+                                    return;
+                                }
                                 try {
+                                    currentFile.setOpen(true);
                                     openOperations.openFile();
                                 } catch (IOException e) {
                                     throw new RuntimeException(e);
@@ -411,16 +443,23 @@ public class MainController {
                     actionContextMenu.getItems().get(1).setOnAction(ActionEvent -> {
                         currentFile = FindLabelToFile.findFile(icons, src);
                         File deleteFile = currentFile;
-                        currentFile = currentFile.getParent();
-                        if (currentFile != rootFile && currentFile.isFolder()) {
-                            openOperations.openFolder(fileExplorer, currentFile, icons);
-                        }
-                        deleteOperations.deleteFile(fileExplorer, icons, deleteFile,fat);
-                        updatePieChart(diskChart);
-                        try {
-                            writeDisk();
-                        } catch (IOException | ClassNotFoundException e) {
-                            throw new RuntimeException(e);
+                        if(!deleteFile.isOpen()) {
+                            currentFile = currentFile.getParent();
+                            if (currentFile != rootFile && currentFile.isFolder()) {
+                                openOperations.openFolder(fileExplorer, currentFile, icons);
+                            }
+                            deleteOperations.deleteFile(fileExplorer, icons, deleteFile, fat);
+                            updatePieChart(diskChart);
+                            try {
+                                writeDisk();
+                            } catch (IOException | ClassNotFoundException e) {
+                                throw new RuntimeException(e);
+                            }
+                        }else {
+                            System.out.println("1");
+                            Alert alert = new Alert(Alert.AlertType.WARNING);
+                            alert.setContentText("文件未关闭!");
+                            alert.show();
                         }
                     });
                     //右键重命名文件
@@ -456,7 +495,14 @@ public class MainController {
                             String pathName = getAbsPath(currentFile);
                             pathText.setText(pathName);
                         } else {
+                            if(currentFile.isOpen()){
+                                Alert alert = new Alert(Alert.AlertType.WARNING);
+                                alert.setContentText("文件已打开!");
+                                alert.show();
+                                return;
+                            }
                             try {
+                                currentFile.setOpen(true);
                                 openOperations.openFile();
                             } catch (IOException e) {
                                 throw new RuntimeException(e);
diff --git a/main/src/operations/openOperations.java b/main/src/operations/openOperations.java
index 41040f4093c3a38fe062fcf522469915be8246bc..f6889044503995dc4f7d2fab1662e2418428be8b 100644
--- a/main/src/operations/openOperations.java
+++ b/main/src/operations/openOperations.java
@@ -53,11 +53,14 @@ public class openOperations {
         stage.setResizable(false);
         stage.setScene(scene);
         stage.setOnCloseRequest(event -> {
+            currentFile.setOpen(false);
             if (currentFile.getParent() == rootFile) {
                 currentFile = rootFile;
             } else {
                 currentFile = currentFile.getParent();
             }
+
+
         });
         stage.show();
     }