User.php

public function grade()
    {
        return $this->hasOne('App\Grade');
    }

Grade.php

public function user()
    {
        return $this->belongsTo('App\User');
    }

phpUser.php定义
public function Grade()
    {
        return $this->hasOne("App\Modules\Grade", 'user_id', 'id');
    }
controller.php
public function index()
{
    $result = User::where('is_admin', 0);
    $users = $result->grade()->get();
    $count = $result->count();       
    return view('admin.list', compact('count', 'users'));
}

view:
@foreach ($users as $user)
    <tr>
        <td>{{$user->id}}</td>
        <td>{{$user->name}}</td>
        <td>{{$user->math}}</td>
        <td>{{$user->english}}</td>
        <td>{{$user->c}}</td>
        <td>{{$user->sport}}</td>
        <td>{{$user->think}}</td>
        <td>{{$user->soft}}</td>
    </tr>
@endforeach

先保证Model中有正确的hasOne和belongsTo
$data = $user->grade()->get();

然后取$data的数据进行循环