diff --git a/View/ArchiveSettingCell.swift b/View/ArchiveSettingCell.swift
index f764147..35d28db 100644
--- a/View/ArchiveSettingCell.swift
+++ b/View/ArchiveSettingCell.swift
@@ -8,7 +8,7 @@
 
 import UIKit
 
-class ArchiveSettingCell: BaseTableViewCell {
+class ArchiveSettingCell: BaseTableViewCell<ArchiveSettingCellViewModel> {
     let switchButton: UISwitch = {
         let btn = UISwitch()
         return btn
@@ -32,12 +32,9 @@ class ArchiveSettingCell: BaseTableViewCell {
         fatalError("init(coder:) has not been implemented")
     }
 
-    override func bindViewModel(model: ViewModel) {
+    override func bindViewModel(model: ArchiveSettingCellViewModel) {
         super.bindViewModel(model: model)
-        guard let viewModel = model as? ArchiveSettingCellViewModel else {
-            return
-        }
-        (self.switchButton.rx.isOn <-> viewModel.on)
+        (self.switchButton.rx.isOn <-> model.on)
             .disposed(by: rx.reuseBag)
     }
 }
diff --git a/View/BaseTableViewCell.swift b/View/BaseTableViewCell.swift
index 5dacced..228d371 100644
--- a/View/BaseTableViewCell.swift
+++ b/View/BaseTableViewCell.swift
@@ -8,9 +8,9 @@
 
 import UIKit
 
-class BaseTableViewCell: UITableViewCell {
-    var viewModel: ViewModel?
-    func bindViewModel(model: ViewModel) {
+class BaseTableViewCell<T>: UITableViewCell where T: ViewModel {
+    var viewModel: T?
+    func bindViewModel(model: T) {
         self.viewModel = model
     }
 }
diff --git a/View/GroupTableViewCell.swift b/View/GroupTableViewCell.swift
index 7689cdf..89c38a0 100644
--- a/View/GroupTableViewCell.swift
+++ b/View/GroupTableViewCell.swift
@@ -9,7 +9,7 @@
 import Material
 import UIKit
 
-class GroupTableViewCell: BaseTableViewCell {
+class GroupTableViewCell: BaseTableViewCell<GroupCellViewModel> {
     let nameLabel: UILabel = {
         let label = UILabel()
         label.fontSize = 14
@@ -47,7 +47,7 @@ class GroupTableViewCell: BaseTableViewCell {
         let tap = UITapGestureRecognizer()
         self.contentView.addGestureRecognizer(tap)
         tap.rx.event.subscribe(onNext: { [weak self] _ in
-            (self?.viewModel as? GroupCellViewModel)?.checked.accept(!self!.checkButton.isSelected)
+            self?.viewModel?.checked.accept(!self!.checkButton.isSelected)
         }).disposed(by: rx.disposeBag)
     }
 
@@ -56,24 +56,21 @@ class GroupTableViewCell: BaseTableViewCell {
         fatalError("init(coder:) has not been implemented")
     }
     
-    override func bindViewModel(model: ViewModel) {
+    override func bindViewModel(model: GroupCellViewModel) {
         super.bindViewModel(model: model)
-        guard let viewModel = model as? GroupCellViewModel else {
-            return
-        }
-        
-        viewModel.name
+
+        model.name
             .map { name in
                 name ?? NSLocalizedString("default")
             }
             .bind(to: nameLabel.rx.text)
             .disposed(by: rx.reuseBag)
         
-        viewModel.checked
+        model.checked
             .bind(to: self.checkButton.rx.isSelected)
             .disposed(by: rx.reuseBag)
         
-        viewModel.checked.subscribe(
+        model.checked.subscribe(
             onNext: { [weak self] checked in
                 self?.checkButton.tintColor = checked ? BKColor.lightBlue.darken3 : BKColor.grey.base
             }).disposed(by: rx.reuseBag)
diff --git a/View/MessageTableViewCell.swift b/View/MessageTableViewCell.swift
index dcb7dd8..08e056b 100644
--- a/View/MessageTableViewCell.swift
+++ b/View/MessageTableViewCell.swift
@@ -8,7 +8,7 @@
 
 import Material
 import UIKit
-class MessageTableViewCell: BaseTableViewCell {
+class MessageTableViewCell: BaseTableViewCell<MessageTableViewCellViewModel> {
     let backgroundPanel: UIView = {
         let view = UIView()
         view.layer.cornerRadius = 3
@@ -121,21 +121,19 @@ class MessageTableViewCell: BaseTableViewCell {
         }
     }
 
-    override func bindViewModel(model: ViewModel) {
+    override func bindViewModel(model: MessageTableViewCellViewModel) {
         super.bindViewModel(model: model)
-        guard let viewModel = model as? MessageTableViewCellViewModel else {
-            return
-        }
-        viewModel.title.bind(to: self.titleLabel.rx.text).disposed(by: rx.reuseBag)
-        viewModel.body.bind(to: self.bodyLabel.rx.text).disposed(by: rx.reuseBag)
-        viewModel.url.bind(to: self.urlLabel.rx.text).disposed(by: rx.reuseBag)
-        viewModel.date.bind(to: self.dateLabel.rx.text).disposed(by: rx.reuseBag)
+
+        model.title.bind(to: self.titleLabel.rx.text).disposed(by: rx.reuseBag)
+        model.body.bind(to: self.bodyLabel.rx.text).disposed(by: rx.reuseBag)
+        model.url.bind(to: self.urlLabel.rx.text).disposed(by: rx.reuseBag)
+        model.date.bind(to: self.dateLabel.rx.text).disposed(by: rx.reuseBag)
         
-        viewModel.title.map { $0.count <= 0 }.bind(to: self.titleLabel.rx.isHidden).disposed(by: rx.reuseBag)
-        viewModel.url.map { $0.count <= 0 }.bind(to: self.urlLabel.rx.isHidden).disposed(by: rx.reuseBag)
+        model.title.map { $0.count <= 0 }.bind(to: self.titleLabel.rx.isHidden).disposed(by: rx.reuseBag)
+        model.url.map { $0.count <= 0 }.bind(to: self.urlLabel.rx.isHidden).disposed(by: rx.reuseBag)
         
         self.urlLabel.gestureRecognizers?.first?.rx.event
             .map { [weak self] _ in self?.urlLabel.text ?? "" }
-            .bind(to: viewModel.urlTap).disposed(by: rx.reuseBag)
+            .bind(to: model.urlTap).disposed(by: rx.reuseBag)
     }
 }
diff --git a/View/MutableTextCell.swift b/View/MutableTextCell.swift
index 937acbe..d594d63 100644
--- a/View/MutableTextCell.swift
+++ b/View/MutableTextCell.swift
@@ -8,7 +8,7 @@
 
 import UIKit
 
-class MutableTextCell: BaseTableViewCell {
+class MutableTextCell: BaseTableViewCell<MutableTextCellViewModel> {
 
     override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
         super.init(style: UITableViewCell.CellStyle.value1, reuseIdentifier: reuseIdentifier)
@@ -22,14 +22,12 @@ class MutableTextCell: BaseTableViewCell {
     required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
-
-    override func bindViewModel(model: ViewModel) {
+    
+    override func bindViewModel(model: MutableTextCellViewModel) {
         super.bindViewModel(model: model)
-        guard let viewModel = model as? MutableTextCellViewModel else {
-            return
-        }
-        self.textLabel?.text = viewModel.title
-        viewModel.text
+        
+        self.textLabel?.text = model.title
+        model.text
             .drive(self.detailTextLabel!.rx.text)
             .disposed(by: rx.reuseBag)
     }
diff --git a/View/PreviewCardCell.swift b/View/PreviewCardCell.swift
index a4b543b..6e6de0d 100644
--- a/View/PreviewCardCell.swift
+++ b/View/PreviewCardCell.swift
@@ -9,7 +9,7 @@
 import Material
 import UIKit
 
-class PreviewCardCell: BaseTableViewCell {
+class PreviewCardCell: BaseTableViewCell<PreviewCardCellViewModel> {
     let previewButton = IconButton(image: Icon.cm.skipForward, tintColor: BKColor.grey.base)
     let copyButton = IconButton(image: UIImage(named: "baseline_file_copy_white_24pt"), tintColor: BKColor.grey.base)
     
@@ -142,23 +142,22 @@ class PreviewCardCell: BaseTableViewCell {
         noticeLabel.addGestureRecognizer(UITapGestureRecognizer())
     }
     
-    override func bindViewModel(model: ViewModel) {
-        guard let viewModel = model as? PreviewCardCellViewModel else {
-            return
-        }
-        viewModel.title
+    override func bindViewModel(model: PreviewCardCellViewModel) {
+        super.bindViewModel(model: model)
+        
+        model.title
             .bind(to: self.titleLabel.rx.text).disposed(by: rx.reuseBag)
-        viewModel.body
+        model.body
             .bind(to: self.bodyLabel.rx.text).disposed(by: rx.reuseBag)
-        viewModel.content
+        model.content
             .bind(to: self.contentLabel.rx.attributedText).disposed(by: rx.reuseBag)
-        viewModel.notice
+        model.notice
             .bind(to: self.noticeLabel.rx.attributedText).disposed(by: rx.reuseBag)
-        viewModel.contentImage
+        model.contentImage
             .compactMap { $0 }
             .bind(to: self.contentImageView.rx.image)
             .disposed(by: rx.reuseBag)
-        viewModel.contentImage
+        model.contentImage
             .map { $0 == nil }
             .bind(to: self.contentImageView.rx.isHidden)
             .disposed(by: rx.reuseBag)
@@ -170,14 +169,14 @@ class PreviewCardCell: BaseTableViewCell {
                 // 仅在有 moreViewModel 时 点击
                 weakModel?.previewModel.moreViewModel
             }
-            .bind(to: viewModel.noticeTap)
+            .bind(to: model.noticeTap)
             .disposed(by: rx.reuseBag)
         
         // 点击复制
         copyButton.rx.tap.map { [weak self] () -> String in
             self?.contentLabel.text ?? ""
         }
-        .bind(to: viewModel.copy)
+        .bind(to: model.copy)
         .disposed(by: rx.reuseBag)
         
         // 点击预览
@@ -189,7 +188,7 @@ class PreviewCardCell: BaseTableViewCell {
             }
             return nil
         }
-        .bind(to: viewModel.preview)
+        .bind(to: model.preview)
         .disposed(by: rx.reuseBag)
     }
 }
diff --git a/View/SoundCell.swift b/View/SoundCell.swift
index f57423a..354d6ef 100644
--- a/View/SoundCell.swift
+++ b/View/SoundCell.swift
@@ -10,7 +10,7 @@ import AVKit
 import Material
 import UIKit
 
-class SoundCell: BaseTableViewCell {
+class SoundCell: BaseTableViewCell<SoundCellViewModel> {
     let copyButton = IconButton(image: UIImage(named: "baseline_file_copy_white_24pt"), tintColor: BKColor.grey.base)
     let nameLabel: UILabel = {
         let label = UILabel()
@@ -54,23 +54,20 @@ class SoundCell: BaseTableViewCell {
         fatalError("init(coder:) has not been implemented")
     }
     
-    override func bindViewModel(model: ViewModel) {
+    override func bindViewModel(model: SoundCellViewModel) {
         super.bindViewModel(model: model)
-        guard let viewModel = model as? SoundCellViewModel else {
-            return
-        }
-        
-        viewModel.name
+
+        model.name
             .bind(to: nameLabel.rx.text)
             .disposed(by: rx.reuseBag)
-        viewModel.duration
+        model.duration
             .map { String(format: "%.2g second(s)", CMTimeGetSeconds($0)) }
             .bind(to: durationLabel.rx.text)
             .disposed(by: rx.reuseBag)
         
         copyButton.rx.tap
-            .map { viewModel.name.value }
-            .bind(to: viewModel.copyNameAction)
+            .map { model.name.value }
+            .bind(to: model.copyNameAction)
             .disposed(by: rx.reuseBag)
     }
 }