1, enter the settings, find Python Console in the Console, check the option "Add source roots to PYTHONPAT" I did not do this step has always been checked on
2 projects in the current program directory, right-click, then "Mark Directory as" as "Sources Root". After the current program directory color will change, it said that it has completed mark.
3, after the introduction of the program part of the wave will disappear below the line, but also can "Ctrl + Alt + B" of the source view.
Summary: The reason is because the red wavy line local path has not been marked "Source Catalog"