Method for manufacturing floating gate TiN film of ultra-flash memory

The invention discloses a method for manufacturing a floating gate TiN film of an ultra-flash memory, which comprises the following steps of: completing a preorder process according to the prior art until groove etching is completed; tiN is deposited; depositing a wrapping layer to wrap TiN; photoetching to define a protection region and a non-protection region, forming a protection layer to protect the protection region, and exposing the non-protection region; etching to remove the wrapping layer in the non-protection area, and exposing the TiN in the non-protection area; removing the protection layer of the protection area; etching to remove TiN in a non-protection region; depositing a wrapping layer to wrap the TiN of the protection area; etching to remove the wrapping layer at the top of the protection region and the bottom of the groove to form a wrapping layer side wall; and etching to remove the TiN at the top of the protection region and the bottom of the groove and the side wall of the wrapping layer