Anyway I can get the result data through API?

[jshen4]

It's cool for using splunk cloud UI to monitor the data.

But If I just want to monitor the data in my own site. (I have used the forwarder in my linux),  is there any API I can call to get the data which meet some specific condition?

[richgalloway]

The data from your own site has been forwarded to Splunk Cloud so that is the only place where you can get it (unless it's still stored in your Linux file system somewhere).
There is a REST API you can use to get the data, but you must first submit a ticket to Splunk Cloud Support to enable REST access. See https://docs.splunk.com/Documentation/Splunk/8.0.5/RESTTUT/RESTandCloud , https://docs.splunk.com/Documentation/Splunk/8.0.5/RESTUM/RESTusing , and https://docs.splunk.com/Documentation/Splunk/8.0.5/RESTTUT/RESTsearches