I custom TickProvider,and the MajorGridLines is show correct. but it's weird on the left and right.
There is double line,how to delete left and right MajorGridLines and show label on the left and right?
Its hard to say. Have you pointed WPF Snoop at your applicaiton to determine the source of the line?
Things it could be:
Have a look at the documentation on Templating and Styling Chart Parts to see what parts of the chart you can colour and how.