Hello @chenpeng
If you are literally cloning the host system (VMware clone, for example), then no - as that will retain any software settings, QlikView's included. The only thing you'll need to look out for are possible name changes for the machine, though you mentioned only the IP address changes so you seem to have that covered.
Also of course where your files are stored such as your .qvw files and source files/databases that QlikVIew needs access to. The new clone needs to have access to it.
The user credentials for the service account is also important - so if that doesn't change, you're good.
If you're only cloning an existing operating system and installing QlikView anew to migrate over, then you'll need to carry out settings again. This article is a good place to start with information about it: Migrating QlikView to a new machine.
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