diff --git a/src/BootstrapBlazor/Components/Nav/Nav.razor b/src/BootstrapBlazor/Components/Nav/Nav.razor
index f3eeef9267c32bb18c1c2c9e4f4e7418d972d656..1a802e51d6600b327e7fa9b4ffdcfde48969e012 100644
--- a/src/BootstrapBlazor/Components/Nav/Nav.razor
+++ b/src/BootstrapBlazor/Components/Nav/Nav.razor
@@ -2,9 +2,9 @@
 @inherits NavBase
 
 <nav @attributes="@AdditionalAttributes" class="@ClassString">
-    @foreach(var item in Items?? new NavLink[0])
+    @foreach (var item in Items)
     {
         @Render(item)
     }
     @ChildContent
-</nav>
\ No newline at end of file
+</nav>
diff --git a/src/BootstrapBlazor/Components/Nav/NavBase.cs b/src/BootstrapBlazor/Components/Nav/NavBase.cs
index c63670df96f0090f14567bfc75f5bd0e629b5c41..0b360e228887285a31b6f27e62f5a7dba1289c32 100644
--- a/src/BootstrapBlazor/Components/Nav/NavBase.cs
+++ b/src/BootstrapBlazor/Components/Nav/NavBase.cs
@@ -30,6 +30,7 @@ public abstract class NavBase : BootstrapComponentBase
     /// 获得/设置 组件数据源
     /// </summary>
     [Parameter]
+    [NotNull]
     public IEnumerable<NavLink>? Items { get; set; }
 
     /// <summary>
@@ -68,6 +69,16 @@ public abstract class NavBase : BootstrapComponentBase
     [Parameter]
     public RenderFragment? ChildContent { get; set; }
 
+    /// <summary>
+    /// OnParametersSet 方法
+    /// </summary>
+    protected override void OnParametersSet()
+    {
+        base.OnParametersSet();
+
+        Items ??= Enumerable.Empty<NavLink>();
+    }
+
     /// <summary>
     /// 获得 NavLink 组件渲染内容
     /// </summary>
diff --git a/test/UnitTest/Components/NavTest.cs b/test/UnitTest/Components/NavTest.cs
new file mode 100644
index 0000000000000000000000000000000000000000..7bf7bcbfe2ba1453555b06fa48ad480f3e55403e
--- /dev/null
+++ b/test/UnitTest/Components/NavTest.cs
@@ -0,0 +1,130 @@
+// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+// Website: https://www.blazor.zone or https://argozhang.github.io/
+
+using Microsoft.AspNetCore.Components.Routing;
+
+namespace UnitTest.Components;
+
+public class NavTest : BootstrapBlazorTestBase
+{
+    [Fact]
+    public void Items_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder => builder.Add(s => s.Items, GetItems()));
+        Assert.Contains("href=\"/Admin/Index\"", cut.Markup);
+
+        cut.SetParametersAndRender(pb => pb.Add(a => a.Items, null));
+    }
+
+    [Fact]
+    public void Alignment_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder =>
+        {
+            builder.Add(s => s.Items, GetItems());
+            builder.Add(s => s.Alignment, Alignment.Right);
+        });
+
+        var ele = cut.Find(".justify-content-end");
+        Assert.NotNull(ele);
+
+        cut.SetParametersAndRender(pb =>
+        {
+            pb.Add(a => a.Alignment, Alignment.Center);
+        });
+        ele = cut.Find(".justify-content-center");
+        Assert.NotNull(ele);
+    }
+
+    [Fact]
+    public void IsVertical_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder =>
+        {
+            builder.Add(s => s.Items, GetItems());
+            builder.Add(s => s.IsVertical, true);
+        });
+
+        var ele = cut.Find(".flex-column");
+        Assert.NotNull(ele);
+    }
+
+    [Fact]
+    public void IsPills_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder =>
+        {
+            builder.Add(s => s.Items, GetItems());
+            builder.Add(s => s.IsPills, true);
+        });
+
+        var ele = cut.Find(".nav-pills");
+        Assert.NotNull(ele);
+    }
+
+    [Fact]
+    public void IsFill_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder =>
+        {
+            builder.Add(s => s.Items, GetItems());
+            builder.Add(s => s.IsPills, true);
+            builder.Add(s => s.IsFill, true);
+        });
+
+        var ele = cut.Find(".nav-fill");
+        Assert.NotNull(ele);
+    }
+
+    [Fact]
+    public void IsJustified_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder =>
+        {
+            builder.Add(s => s.Items, GetItems());
+            builder.Add(s => s.IsPills, true);
+            builder.Add(s => s.IsFill, true);
+            builder.Add(s => s.IsJustified, true);
+        });
+
+        var ele = cut.Find(".nav-justified");
+        Assert.NotNull(ele);
+    }
+
+    [Fact]
+    public void ChildContent_OK()
+    {
+        var cut = Context.RenderComponent<Nav>(builder =>
+        {
+            builder.Add(s => s.Items, GetItems());
+            builder.Add(s => s.ChildContent, new RenderFragment(builder =>
+            {
+                builder.OpenComponent<Button>(0);
+                builder.CloseComponent();
+            }));
+        });
+
+        var component = cut.FindComponent<Button>();
+        Assert.NotNull(component);
+    }
+
+    private IEnumerable<NavLink> GetItems()
+    {
+        var ret = new List<NavLink>();
+        var link = new NavLink();
+        var parameters = new Dictionary<string, object?>()
+        {
+            ["href"] = "/Admin/Index",
+            ["class"] = "nav-link nav-item",
+            ["target"] = "_blank",
+            ["ChildContent"] = new RenderFragment(builder =>
+            {
+                builder.AddContent(0, "BootstrapAdmin");
+            })
+        };
+        link.SetParametersAsync(ParameterView.FromDictionary(parameters!));
+        ret.Add(link);
+        return ret;
+    }
+}