Hi Yuxuan Li,

if you only want to display the navigation on the service pages you can do something like this:

<ul>

@foreach(var child in Model.Content.Children)
{
    <li><a href="@child.Url">@child.Name</a></li>
}

</ul>

If you also want to display it on the child pages:

<ul>

@foreach(var child in Model.Content.AncestorOrSelf("servicePageAlias").Children)
{
    <li><a href="@child.Url">@child.Name</a></li>
}

</ul>

/Michaël