谢谢

Option Explicit
Private Const CB_SETITEMHEIGHT& = &H153
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Private Sub Command1_Click()
    Dim NewHeight As Long
    NewHeight = 100 '以像素为单位
    SendMessage Combo1.hwnd, CB_SETITEMHEIGHT, -1, ByVal NewHeight
End Sub