好了，搞好了
// If true, the selected text will be copied into the find panel when it's
// shown.
// On OS X, this value is overridden in the platform specific settings, so
// you'll need to place this line in your user settings to override it.
"find_selected_text": true,

// When auto_find_in_selection is enabled, the "Find in Selection" flag
// will be enabled automatically when multiple lines of text are selected
"auto_find_in_selection": false,

把"find_selected_text": true,从 setting default 复制到 setting user 就好了。。。