diff --git a/BakNRet/BakNRet.psd1 b/BakNRet/BakNRet.psd1
index a2d8408..1039b73 100644
--- a/BakNRet/BakNRet.psd1
+++ b/BakNRet/BakNRet.psd1
@@ -19,6 +19,7 @@
     CompatiblePSEditions = @('Desktop', 'Core')
 
     FunctionsToExport    = @(
+        'Invoke-BakNRetConfigEditor',
         'Read-BakNRetLine',
         'Get-BakNRetConfigSetting',
         'Set-BakNRetConfigSetting',
diff --git a/BakNRet/BakNRet.psm1 b/BakNRet/BakNRet.psm1
index c24962c..625da38 100644
--- a/BakNRet/BakNRet.psm1
+++ b/BakNRet/BakNRet.psm1
@@ -173,7 +173,10 @@
 
 . (Join-Path $PSScriptRoot 'Public\Read-BakNRetLine.ps1')
 
+. (Join-Path $PSScriptRoot 'Public\Invoke-BakNRetConfigEditor.ps1')
+
 Export-ModuleMember -Function @(
+    'Invoke-BakNRetConfigEditor',
     'Read-BakNRetLine',
     'Get-BakNRetConfigSetting',
     'Set-BakNRetConfigSetting',
diff --git a/BakNRet/Public/Invoke-BakNRetConfigEditor.ps1 b/BakNRet/Public/Invoke-BakNRetConfigEditor.ps1
new file mode 100644
index 0000000..fb8ff00
--- /dev/null
+++ b/BakNRet/Public/Invoke-BakNRetConfigEditor.ps1
@@ -0,0 +1,85 @@
+function Invoke-BakNRetConfigEditor {
+    <#
+    .SYNOPSIS
+        配置编辑器：列出单行标量设置 → 选一个 → 输入新值 → 校验后保存（并留时间戳备份）。
+
+    .DESCRIPTION
+        装配：Get-BakNRetConfigSetting（读）→ Invoke-BakNRetMenu（选）→ Read-BakNRetLine（输入）
+        → Set-BakNRetConfigSetting（只改那一行）→ Save-BakNRetConfigFile（校验通过才原子替换）。
+
+        输入行**从空开始**、当前值只作为提示显示：预填当前值看着贴心，实际上等于逼用户先删一遍
+        （对 `'Backups'` 这种带引号的原文尤其别扭）。
+
+        校验用 Import-PowerShellDataFile：这份配置里没有动态表达式，能被它读进来是个**强校验**
+        —— 比"语法能不能过"更强，它还能抓出"值是合法语法、但结构不对"。它只接受文件路径，所以
+        先把候选文本写到临时文件再读。
+
+        取消（选设置或输入时按 Esc）→ 什么都不写、也不产生备份。
+        值没变 → 直接返回"没有变化"，不做无意义的写盘与备份。
+    #>
+    param(
+        [Parameter(Mandatory = $true)][string]$Path,
+        [Parameter(Mandatory = $true)]$Driver,
+        [switch]$WhatIf
+    )
+
+    if (-not (Test-Path -LiteralPath $Path)) {
+        return [pscustomobject]@{ Saved = $false; Changed = $false; Error = "找不到配置文件：$Path"; BackupPath = $null }
+    }
+
+    $text = Get-Content -LiteralPath $Path -Raw -Encoding UTF8
+    $rows = @(Get-BakNRetConfigSetting -Text $text)
+
+    if ($rows.Count -eq 0) {
+        return [pscustomobject]@{ Saved = $false; Changed = $false; Error = '配置里没有可编辑的单行标量设置。'; BackupPath = $null }
+    }
+
+    $items = @(foreach ($row in $rows) {
+            [pscustomobject]@{ Key = $row.Path; Text = ('{0,-26} = {1}' -f $row.Path, $row.Value) }
+        })
+
+    $picked = Invoke-BakNRetMenu -Title ('配置：{0}' -f $Path) -Items $items -Driver $Driver -MultiSelect $false -Hint '↑↓ 选设置　回车 改值　Esc 取消'
+    if ($picked.Action -ne 'confirm') {
+        return [pscustomobject]@{ Saved = $false; Changed = $false; Error = ''; BackupPath = $null }
+    }
+
+    $setting = $rows | Where-Object { $_.Path -eq [string]$picked.Chosen.Key } | Select-Object -First 1
+
+    Write-BakNRetAt -X 0 -Y 0 -Text ("{0} 当前是 {1}；输入新值后回车确认，Esc 取消（留空表示空串）：" -f $setting.Path, $setting.Value) -ForegroundColor Cyan
+    $newValue = Read-BakNRetLine -Driver $Driver
+    if ($null -eq $newValue) {
+        return [pscustomobject]@{ Saved = $false; Changed = $false; Error = ''; BackupPath = $null }
+    }
+
+    if ($newValue -eq $setting.Value) {
+        return [pscustomobject]@{ Saved = $false; Changed = $false; Error = '值没有变化，没有要保存的内容。'; BackupPath = $null }
+    }
+
+    $newText = Set-BakNRetConfigSetting -Text $text -Path $setting.Path -Value $newValue
+
+    $validate = {
+        param($candidate)
+        $probePath = Join-Path ([System.IO.Path]::GetTempPath()) ('bnr-cfg-' + [guid]::NewGuid().ToString('N').Substring(0, 8) + '.psd1')
+        try {
+            [System.IO.File]::WriteAllText($probePath, $candidate, (New-Object System.Text.UTF8Encoding($true)))
+            $null = Import-PowerShellDataFile -Path $probePath -ErrorAction Stop
+            return @()
+        }
+        catch {
+            return @('改完之后读不回来：' + $_.Exception.Message)
+        }
+        finally {
+            Remove-Item -LiteralPath $probePath -Force -ErrorAction SilentlyContinue
+        }
+    }
+
+    $saved = Save-BakNRetConfigFile -Path $Path -Text $newText -Validate $validate `
+        -BackupDirectory (Join-Path (Split-Path -Parent $Path) 'logs\config-backups') -WhatIf:$WhatIf
+
+    return [pscustomobject]@{
+        Saved      = $saved.Saved
+        Changed    = $true
+        Error      = $saved.Error
+        BackupPath = $saved.BackupPath
+    }
+}
diff --git a/Edit-Config.ps1 b/Edit-Config.ps1
index 40f28b3..b43468e 100644
--- a/Edit-Config.ps1
+++ b/Edit-Config.ps1
@@ -56,8 +56,18 @@ if ($Target -eq 'List') {
     exit (Invoke-BakNRetListEditorEntry -Path $ListPath -Script $InputScript)
 }
 
+if ($Target -eq 'Settings') {
+    $configPath = Join-Path $PSScriptRoot 'BackupConfig.psd1'
+    $driver = New-BakNRetInputDriver -Script $InputScript -NonInteractive:$([bool]$InputScript)
+    $saved = Invoke-BakNRetConfigEditor -Path $configPath -Driver $driver
+    if ($saved.Saved) { Write-Host ("已保存：{0}" -f $configPath) -ForegroundColor Green; Write-Host ("原文件备份：{0}" -f $saved.BackupPath) -ForegroundColor DarkGray; exit 0 }
+    if ($saved.Error) { Write-Host $saved.Error -ForegroundColor Yellow; exit 1 }
+    Write-Host '没有改动。' -ForegroundColor DarkGray
+    exit 0
+}
+
 if ($Target) {
-    Write-Host ("{0} 的编辑器还没做：清单已完成；设置与名录分别是第二轮与第三轮的工作。" -f $Target) -ForegroundColor Yellow
+    Write-Host ("{0} 的编辑器还没做：清单与设置已完成；名录是第三轮的工作。" -f $Target) -ForegroundColor Yellow
     exit 1
 }
 
@@ -82,5 +92,15 @@ if ($picked.Chosen.Key -eq 'List') {
     exit (Invoke-BakNRetListEditorEntry -Path $ListPath -Script $InputScript)
 }
 
-Write-Host ("{0} 的编辑器还没做。" -f $picked.Chosen.Key) -ForegroundColor Yellow
+if ($picked.Chosen.Key -eq 'Settings') {
+    $configPath = Join-Path $PSScriptRoot 'BackupConfig.psd1'
+    $driver2 = New-BakNRetInputDriver -Script $InputScript -NonInteractive:$([bool]$InputScript)
+    $saved2 = Invoke-BakNRetConfigEditor -Path $configPath -Driver $driver2
+    if ($saved2.Saved) { Write-Host ("已保存：{0}" -f $configPath) -ForegroundColor Green; exit 0 }
+    if ($saved2.Error) { Write-Host $saved2.Error -ForegroundColor Yellow; exit 1 }
+    Write-Host '没有改动。' -ForegroundColor DarkGray
+    exit 0
+}
+
+Write-Host ("{0} 的编辑器还没做（名录是第三轮的工作）。" -f $picked.Chosen.Key) -ForegroundColor Yellow
 exit 1
diff --git a/tests/Run-Tests.ps1 b/tests/Run-Tests.ps1
index 0017dd8..ca0c13e 100644
--- a/tests/Run-Tests.ps1
+++ b/tests/Run-Tests.ps1
@@ -1786,6 +1786,38 @@ Test-Case '输入行：字符追加、Backspace 删除、Esc 取消返回 $null
     Assert-Equal 'k' (Read-BakNRetLine -Driver (New-BakNRetInputDriver -Script @('Char:K', 'Enter'))) '字母按小写存（与键名归一化一致）'
 }
 
+Test-Case '配置编辑器：脚本驱动改一个值，只动那一行且留下备份；取消不写盘' {
+    $dir = Join-Path $env:TEMP ("bnr-cfged-" + [guid]::NewGuid().ToString('N').Substring(0, 8))
+    New-Item -ItemType Directory -Path $dir -Force | Out-Null
+    $file = Join-Path $dir 'BackupConfig.psd1'
+    Copy-Item -LiteralPath (Join-Path (Split-Path -Parent $PSScriptRoot) 'BackupConfig.psd1') -Destination $file
+    $original = [System.IO.File]::ReadAllText($file)
+    $backupDir = Join-Path $dir 'logs\config-backups'
+    try {
+        # MinFreeSpaceGB 是文件里第 5 个标量设置：下移四次选中它，输入 9
+        $keys = @('Down', 'Down', 'Down', 'Down', 'Enter', 'Char:9', 'Enter')
+        $result = Invoke-BakNRetConfigEditor -Path $file -Driver (New-BakNRetInputDriver -Script $keys)
+        Assert-Equal $true $result.Saved '应当保存'
+        $before = @($original -split "`n")
+        $after = @([System.IO.File]::ReadAllText($file) -split "`n")
+        Assert-Equal 2 @(Compare-Object -ReferenceObject $before -DifferenceObject $after).Count '只应当有一行不同'
+        Assert-Equal @($before | Where-Object { $_.TrimStart().StartsWith('#') }).Count @($after | Where-Object { $_.TrimStart().StartsWith('#') }).Count '注释行数不变'
+        Assert-True (([System.IO.File]::ReadAllText($file)) -match 'MinFreeSpaceGB   = 9') '新值写进去了'
+        Assert-True (Test-Path $result.BackupPath) '应当留下时间戳备份'
+        Assert-Equal $original ([System.IO.File]::ReadAllText($result.BackupPath)) '备份里是原文'
+
+        # 取消（选设置时 Esc）：不写盘、不产生新备份
+        $countBefore = @(Get-ChildItem $backupDir -File | Measure-Object).Count
+        $contentBefore = [System.IO.File]::ReadAllText($file)
+        $cancelled = Invoke-BakNRetConfigEditor -Path $file -Driver (New-BakNRetInputDriver -Script @('Esc'))
+        Assert-Equal $false $cancelled.Saved '取消不该保存'
+        Assert-Equal $contentBefore ([System.IO.File]::ReadAllText($file)) '取消后内容不变'
+        Assert-Equal $countBefore @(Get-ChildItem $backupDir -File | Measure-Object).Count '取消不该新增备份'
+    } finally {
+        Remove-Item -LiteralPath $dir -Recurse -Force -ErrorAction SilentlyContinue
+    }
+}
+
 # ============================================================================
 Remove-Item -LiteralPath $sandbox -Recurse -Force -ErrorAction SilentlyContinue
 Remove-Item -LiteralPath $itemSandbox -Recurse -Force -ErrorAction SilentlyContinue