If you want to start User Profile full import automatically, first find the Guid of the SA:

Start miisclient.exe from the path “C:\Program Files\Microsoft Office Servers\14.0\Synchronization Service\UIShell” here you see the guid of the upsa

Now lets create ps1 file, add following scripts in notepad:

Add-PSSnapin Microsoft.SharePoint.PowerShell

$upa = Get-SPServiceApplication 72fed151-af24-4d74-bdb9-ef21f5c262d3

$upa.StartImport($true)

Save the file as ps1 file extension

Now let’s create the task to automate the process.

Start Task Scheduler

Create a basic task and go through the settings and add start a program and add PowerShell.exe

.

In the path of the script in add arguments
. Try run task and see that helps.