diff --git a/Fire/AppDelegate.swift b/Fire/AppDelegate.swift
index b6c21c3..fb39903 100644
--- a/Fire/AppDelegate.swift
+++ b/Fire/AppDelegate.swift
@@ -20,7 +20,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         InputSource.shared.activateInputSource()
         NSApp.terminate(nil)
     }
-    
+
     private func commandHandler() {
         if CommandLine.arguments.count > 1 {
             print("[Fire] launch argument: \(CommandLine.arguments[1])")
diff --git a/Fire/CandidatesView.swift b/Fire/CandidatesView.swift
index 5d24c7f..60075c2 100644
--- a/Fire/CandidatesView.swift
+++ b/Fire/CandidatesView.swift
@@ -87,6 +87,7 @@ struct CandidatesView: View {
         })
         .padding(.horizontal, 10.0)
         .padding(.vertical, 6)
+        .fixedSize()
         .background(Color.white)
     }
 }
diff --git a/Fire/CandidatesWindow.swift b/Fire/CandidatesWindow.swift
index daa1838..acc860b 100644
--- a/Fire/CandidatesWindow.swift
+++ b/Fire/CandidatesWindow.swift
@@ -9,14 +9,18 @@
 import SwiftUI
 import InputMethodKit
 
+var set = false
+
 class CandidatesWindow: NSWindow {
+    let hostingView = NSHostingView(rootView: CandidatesView(candidates: [], origin: ""))
 
     func setCandidates(
         candidates: [Candidate],
         originalString: String,
         topLeft: NSPoint
     ) {
-        self.contentView = NSHostingView(rootView: CandidatesView(candidates: candidates, origin: originalString))
+        hostingView.rootView.candidates = candidates
+        hostingView.rootView.origin = originalString
         let origin = self.transformTopLeft(originalTopLeft: topLeft)
         self.setFrameTopLeftPoint(origin)
         self.orderFront(nil)
@@ -31,9 +35,23 @@ class CandidatesWindow: NSWindow {
         super.init(contentRect: contentRect, styleMask: style, backing: backingStoreType, defer: flag)
 
         level = NSWindow.Level(rawValue: NSWindow.Level.RawValue(CGShieldingWindowLevel()))
-        self.viewsNeedDisplay = true
-        styleMask = .init(arrayLiteral: .borderless, .fullSizeContentView)
+        styleMask = .init(arrayLiteral: .fullSizeContentView, .borderless)
         isReleasedWhenClosed = false
+        backgroundColor = NSColor.clear
+        setSizePolicy()
+    }
+
+    private func setSizePolicy() {
+        // 窗口大小可根据内容变化
+        hostingView.translatesAutoresizingMaskIntoConstraints = false
+        guard self.contentView != nil else {
+            return
+        }
+        self.contentView?.addSubview(hostingView)
+        self.contentView?.leftAnchor.constraint(equalTo: hostingView.leftAnchor).isActive = true
+        self.contentView?.rightAnchor.constraint(equalTo: hostingView.rightAnchor).isActive = true
+        self.contentView?.topAnchor.constraint(equalTo: hostingView.topAnchor).isActive = true
+        self.contentView?.bottomAnchor.constraint(equalTo: hostingView.bottomAnchor).isActive = true
     }
 
     private func transformTopLeft(originalTopLeft: NSPoint) -> NSPoint {