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After checked the requirements on Hyper-v by run "systeminfo.exe" in cmd window, then I enable the all the Hyper-V features including two options, but failed to start Hyper-V quick create app, it only show "not found" dialog, I've to see the system logs in the Event Viewer, Then I see some logs 

The Hyper-V Virtual Machine Management service terminated with the following error: 
Ran out of memory

The Hyper-V Host Compute Service service failed to start due to the following error: 
The service did not respond to the start or control request in a timely fashion.
and

A timeout was reached (30000 milliseconds) while waiting for the Hyper-V Host Compute Service service to connect.

so I searched related webpages via Google, then I found:

https://social.technet.microsoft.com/Forums/en-US/ee5b1d6b-09e2-49f3-a52c-820aafc316f9/hyperv-doesnt-work-after-upgrade-to-windows-10-1809?forum=win10itprovirt

I follow the suggestion in the post:

1, Open "Window Security"

2, Open "App & Browser control"

3, Click "Exploit protection settings" at the bottom

4, Switch to "Program settings" tab

5, Locate "C:\WINDOWS\System32\vmcompute.exe" in the list and expand it

6, Click "Edit"

7, Scroll down to "Code flow guard (CFG)" and uncheck "Override system settings"

8, Start vmcompute from powershell "net start vmcompute"

everything turn good.

Hope it will help anyone see my blog.

The End. Thanks.