I want to ask,is it possible to detect a device that are connected to the usb port?And directly link to the software that we've made?Thanks a lot

You would need to use WMI to detect your USB devices. It depends on whether you are directly attached to a USB port on your PC or through a hub. Using WMI Code Creator (a freebie), I generated this: 

strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2")
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_USBHub",,48)
For Each objItem in colItems
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Win32_USBHub instance"
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Name: " & objItem.Name
Next

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I hope that gets you along the way.