I like to add chapter names in my header. Currently I used this command

 \fancyhead[RO,LE]{Chapter \thechapter}


which can only show the chapter number . How can I add names instead of numbers.

• Try \fancyhead[RO,LE]{\leftmark}. If that does not help, please show us a minimal working example. – Johannes_B Jun 9 '15 at 11:15
• Do you mean adding the chapter title? – Bernard Jun 9 '15 at 11:15
• yeah , \leftmark is working fine for me – botguide Jun 12 '15 at 3:23

\fancyhead[RO,LE]{\leftmark} should do what you want.