diff --git a/ossutil/Aspera.vb b/ossutil/Aspera.vb
index 8e72733..2126d6b 100644
--- a/ossutil/Aspera.vb
+++ b/ossutil/Aspera.vb
@@ -1,9 +1,104 @@
-Imports Microsoft.VisualBasic.CommandLine.InteropService
+Imports System.Text
+Imports Microsoft.VisualBasic.CommandLine.InteropService
 
 ''' <summary>
 ''' aspera cli 
 ''' </summary>
 Public Class Aspera : Inherits InteropService
 
+    Dim maxSpeed$
+    Dim minSpeed$
 
+    ReadOnly server$
+
+    Public Property AdaptiveRate As Boolean
+    Public Property Encryption As Boolean
+
+    ''' <summary>
+    ''' ``&lt;username>@server_name``
+    ''' </summary>
+    ''' <param name="server">``&lt;username>@server_name``</param>
+    ''' <param name="bin">可执行文件路径</param>
+    Sub New(server$, Optional bin$ = "ascp")
+        Call MyBase.New(bin)
+    End Sub
+
+    ''' <summary>
+    ''' 单位都是MB
+    ''' </summary>
+    ''' <param name="min%"></param>
+    ''' <param name="max%"></param>
+    ''' <returns></returns>
+    Public Function Speed(Optional min% = -1, Optional max% = -1) As Aspera
+        If min > 0 Then
+            minSpeed = min & "M"
+        Else
+            minSpeed = Nothing
+        End If
+        If max > 0 Then
+            maxSpeed = max & "M"
+        Else
+            maxSpeed = Nothing
+        End If
+
+        Return Me
+    End Function
+
+    ''' <summary>
+    ''' CLI for file transfer from ``a => b``
+    ''' </summary>
+    ''' <param name="a$"></param>
+    ''' <param name="b$"></param>
+    ''' <returns></returns>
+    ''' <remarks>
+    ''' + l - Allows for the user to set a maximum download speed that aspera should attempt to stay 
+    '''       at or below for the duration of the transfer. A speed in Megabits must be provided 
+    '''       with this flag.
+    ''' + m - Allows for the user to set a minimum download sped that aspera should attempt to stay 
+    '''       at Or above for the duration of the transfer. A speed in Megabits must be provided with 
+    '''       this flag.
+    ''' + Q - Turns adaptive rate on. Adaptive rate controls the speed of aspera with a goal of Not 
+    '''       dominating the bandwidth available. Very useful on busy networks that may have other 
+    '''       transfers ongoing.
+    ''' + T - Turns encryption off. Turning encryption off will allow for a maximum throughput transfer 
+    '''       but should Not be provided if data being uploaded Is sensitive.
+    ''' </remarks>
+    Private Function getCLI(a$, b$) As String
+        Dim cli As New StringBuilder
+
+        If Not maxSpeed.StringEmpty Then
+            Call cli.AppendLine($"-l {maxSpeed}")
+        End If
+        If Not minSpeed.StringEmpty Then
+            Call cli.AppendLine($"-m {minSpeed}")
+        End If
+        If AdaptiveRate Then
+            Call cli.AppendLine("-Q")
+        End If
+        If Not Encryption Then
+            Call cli.AppendLine("-T")
+        End If
+
+        Return cli.ToString
+    End Function
+
+    ''' <summary>
+    ''' 
+    ''' </summary>
+    ''' <param name="local">是本地的一个文件</param>
+    ''' <param name="remote">是服务器上面的一个文件夹</param>
+    ''' <returns></returns>
+    Public Function Upload(local$, remote$) As String
+        Return MyBase.RunProgram(getCLI(local, server & remote)).Run
+    End Function
+
+    ''' <summary>
+    ''' 
+    ''' </summary>
+    ''' <param name="remote">应该是服务器上面的一个文件或者文件夹</param>
+    ''' <param name="local">应该是一个本地文件夹，不存在的话会自动创建</param>
+    ''' <returns></returns>
+    Public Function Download(remote$, local$) As String
+        Return MyBase.RunProgram(getCLI(server & remote, local)).Run
+    End Function
 End Class