diff --git a/src/main/java/ru/ulstu/paper/model/Paper.java b/src/main/java/ru/ulstu/paper/model/Paper.java
index c09fd28..f98b54b 100644
--- a/src/main/java/ru/ulstu/paper/model/Paper.java
+++ b/src/main/java/ru/ulstu/paper/model/Paper.java
@@ -9,26 +9,8 @@ import ru.ulstu.deadline.model.Deadline;
 import ru.ulstu.file.model.FileData;
 import ru.ulstu.user.model.User;
 
-import javax.persistence.CascadeType;
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.EnumType;
-import javax.persistence.Enumerated;
-import javax.persistence.FetchType;
-import javax.persistence.JoinColumn;
-import javax.persistence.ManyToMany;
-import javax.persistence.ManyToOne;
-import javax.persistence.OneToMany;
-import javax.persistence.OrderBy;
-import javax.persistence.Temporal;
-import javax.persistence.TemporalType;
-import java.util.ArrayList;
-import java.util.Comparator;
-import java.util.Date;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Optional;
-import java.util.Set;
+import javax.persistence.*;
+import java.util.*;
 
 @Entity
 public class Paper extends BaseEntity implements UserContainer {
@@ -77,9 +59,11 @@ public class Paper extends BaseEntity implements UserContainer {
 
     private Boolean locked = false;
 
-    @ManyToOne
-    @JoinColumn(name = "file_id")
-    private FileData fileData;
+
+    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
+    @JoinColumn(name = "paper_id", unique = true)
+    @Fetch(FetchMode.SUBSELECT)
+    private List<FileData> files = new ArrayList<>();
 
     @ManyToMany(fetch = FetchType.EAGER)
     private Set<User> authors = new HashSet<>();
@@ -132,12 +116,12 @@ public class Paper extends BaseEntity implements UserContainer {
         this.locked = locked;
     }
 
-    public FileData getFileData() {
-        return fileData;
+    public List<FileData> getFiles() {
+        return files;
     }
 
-    public void setFileData(FileData fileData) {
-        this.fileData = fileData;
+    public void setFiles(List<FileData> files) {
+        this.files = files;
     }
 
     public String getTitle() {
diff --git a/src/main/java/ru/ulstu/paper/model/PaperDto.java b/src/main/java/ru/ulstu/paper/model/PaperDto.java
index 545b432..f870dc3 100644
--- a/src/main/java/ru/ulstu/paper/model/PaperDto.java
+++ b/src/main/java/ru/ulstu/paper/model/PaperDto.java
@@ -79,9 +79,9 @@ public class PaperDto {
         this.comment = paper.getComment();
         this.locked = paper.getLocked();
         this.tmpFileName = null;
-        this.fileId = paper.getFileData() == null ? null : paper.getFileData().getId();
-        this.fileName = paper.getFileData() == null ? null : paper.getFileData().getName();
-        this.fileCreateDate = paper.getFileData() == null ? null : paper.getFileData().getCreateDate();
+//        this.fileId = paper.getFileData() == null ? null : paper.getFileData().getId();
+//        this.fileName = paper.getFileData() == null ? null : paper.getFileData().getName();
+//        this.fileCreateDate = paper.getFileData() == null ? null : paper.getFileData().getCreateDate();
         this.authorIds = convert(paper.getAuthors(), user -> user.getId());
         this.authors = convert(paper.getAuthors(), UserDto::new);
     }
diff --git a/src/main/java/ru/ulstu/paper/service/PaperService.java b/src/main/java/ru/ulstu/paper/service/PaperService.java
index 9df8be2..39c2ace 100644
--- a/src/main/java/ru/ulstu/paper/service/PaperService.java
+++ b/src/main/java/ru/ulstu/paper/service/PaperService.java
@@ -14,20 +14,12 @@ import ru.ulstu.user.model.User;
 import ru.ulstu.user.service.UserService;
 
 import java.io.IOException;
-import java.util.Arrays;
-import java.util.Date;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
+import java.util.*;
 import java.util.stream.Collectors;
 
 import static org.springframework.util.ObjectUtils.isEmpty;
 import static ru.ulstu.core.util.StreamApiUtils.convert;
-import static ru.ulstu.paper.model.Paper.PaperStatus.ATTENTION;
-import static ru.ulstu.paper.model.Paper.PaperStatus.COMPLETED;
-import static ru.ulstu.paper.model.Paper.PaperStatus.DRAFT;
-import static ru.ulstu.paper.model.Paper.PaperStatus.FAILED;
-import static ru.ulstu.paper.model.Paper.PaperStatus.ON_PREPARATION;
+import static ru.ulstu.paper.model.Paper.PaperStatus.*;
 
 @Service
 public class PaperService {
@@ -88,9 +80,9 @@ public class PaperService {
         paper.setTitle(paperDto.getTitle());
         paper.setUpdateDate(new Date());
         paper.setDeadlines(deadlineService.saveOrCreate(paperDto.getDeadlines()));
-        if (paperDto.getTmpFileName() != null) {
-            paper.setFileData(fileService.createFileFromTmp(paperDto.getTmpFileName()));
-        }
+//        if (paperDto.getTmpFileName() != null) {
+//            paper.setFileData(fileService.createFileFromTmp(paperDto.getTmpFileName()));
+//        }
         paper.getAuthors().clear();
         if (paperDto.getAuthorIds() != null && !paperDto.getAuthorIds().isEmpty()) {
             paperDto.getAuthorIds().forEach(authorIds -> paper.getAuthors().add(userService.findById(authorIds)));
@@ -103,9 +95,9 @@ public class PaperService {
         Paper paper = paperRepository.findOne(paperDto.getId());
         Paper.PaperStatus oldStatus = paper.getStatus();
         Set<User> oldAuthors = new HashSet<>(paper.getAuthors());
-        if (paperDto.getTmpFileName() != null && paper.getFileData() != null) {
-            fileService.deleteFile(paper.getFileData());
-        }
+//        if (paperDto.getTmpFileName() != null && paper.getFileData() != null) {
+//            fileService.deleteFile(paper.getFileData());
+//        }
         paperRepository.save(copyFromDto(paper, paperDto));
 
         paper.getAuthors().forEach(author -> {
@@ -124,9 +116,9 @@ public class PaperService {
     @Transactional
     public void delete(Integer paperId) throws IOException {
         Paper paper = paperRepository.findOne(paperId);
-        if (paper.getFileData() != null) {
-            fileService.deleteFile(paper.getFileData());
-        }
+//        if (paper.getFileData() != null) {
+//            fileService.deleteFile(paper.getFileData());
+//        }
         paperRepository.delete(paper);
     }
 
diff --git a/src/main/resources/db/changelog-20190318_000000-schema.xml b/src/main/resources/db/changelog-20190318_000000-schema.xml
new file mode 100644
index 0000000..d1966b4
--- /dev/null
+++ b/src/main/resources/db/changelog-20190318_000000-schema.xml
@@ -0,0 +1,23 @@
+<?xml version="1.1" encoding="UTF-8" standalone="no"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
+    <changeSet author="masha" id="20190318_000000-1">
+        <dropColumn columnName="file_id" tableName="paper"/>
+        <addColumn tableName="file">
+            <column name="paper_id" type="integer"/>
+        </addColumn>
+
+        <createTable tableName="paper_files">
+            <column name="paper_id" type="integer"/>
+            <column name="file_id" type="integer"/>
+        </createTable>
+        <addForeignKeyConstraint baseTableName="paper_files" baseColumnNames="paper_id"
+                                 constraintName="fk_paper_paper_files" referencedTableName="paper"
+                                 referencedColumnNames="id"/>
+        <addForeignKeyConstraint baseTableName="paper_files" baseColumnNames="file_id"
+                                 constraintName="fk_file_paper_files" referencedTableName="file"
+                                 referencedColumnNames="id"/>
+
+    </changeSet>
+</databaseChangeLog>
diff --git a/src/main/resources/db/changelog-master.xml b/src/main/resources/db/changelog-master.xml
index b8654ae..dcba122 100644
--- a/src/main/resources/db/changelog-master.xml
+++ b/src/main/resources/db/changelog-master.xml
@@ -18,5 +18,6 @@
     <include file="db/changelog-20181111_000000-schema.xml"/>
     <include file="db/changelog-20181208_000000-schema.xml"/>
     <include file="db/changelog-20181224_000000-schema.xml"/>
+    <include file="db/changelog-20190318_000000-schema.xml"/>
     <include file="db/common/changelog-20190312_130000-schema.xml"/>
 </databaseChangeLog>
\ No newline at end of file