Hi Yanjie! SourceTree does not highlight the spaces in the diff-view, it can show you the lines where whitespaces have been modified, but will not highlight them.
If you'd like to have that option available,you're welcome to submit a Feature request at jira.atlassian.com, by clicking on Create. This will be available publicly so other users can vote for it and add their comments.
Hope this helps :)
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