I wan to use SSIS. Does Microsoft SQL Server 2008 R2 Developer Edition have the function? Thanks.

Yes, it does. Make sure you install it from the "features". By the way, the Developer Edition is the same as the Enterprise in features, but you cannot use it in production. Arthur My Blog

What is meant production?

I mean that this edition is comparable in features to the Enterprise edition of the SQL Server 2008 R2, but its license prohibits using on a production machine, this is why it is called Development, so the development only would be done using this edition. By the way, here is the image where you select the SSIS to install: Arthur My Blog