(1) I reverse engineer a program in Ida pro and I see lots of "db" instructions
(2) In olly debugger ,"db" instruction can be remove by option "remove code analysis from this module".
(3) how i can remove code analysis from Ida pro?
(4) i have also tried code deobfuscator plugin in ida but that not seem to work
You might want to "undefine" bytes. There are also other possibilities depending on what you want exactly.
Select something in the main window then press one of those key:
See the "Edit" menu for more options.