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how can add sim900(sim900.h) header to keil. it is possible to add
Place sim900.h (and any source/library it requires) in YOUR project directory, then #include "sim900.h", you could probably place it in different paths if you set those up in the project as include paths for it to search.
Remember an INCLUDE file is *NOT* a LIBRARY file, and merely provides interfacing information for the compiler to know how to call the functions, not the body of the code that implements them.
i can place sim900.h but error is "can't open file 'SIM900.h'"
Have you looked-up that message in the Manual: http://www.keil.com/support/man/docs/c51/c51_errors.htm
Did you correctly configure the Include Path: http://www.keil.com/support/man/docs/c51/c51_incdir.htm http://www.keil.com/support/man/docs/uv4/uv4_dg_c51.htm
how to download sim900 header file and add to keil
How to download it has nothing to do with Keil!
And, since nobody knows what particular "sim900 header file" you're talking about, nobody can tell you anything specific about it!
As to using it a Keil project, you've already asked that - and had the answer!
Perhaps what you really need to do is to go back to basics and start to get a proper understanding of the tools - by studying the documentation and working through the examples they provide...?
In your Keil installation, there is a Getting Started Guide - search for "GS51"
uVision IDE manual: http://www.keil.com/support/man/docs/uv4/
C51 Compiler manual: http://www.keil.com/support/man/docs/c51/
Worked examples here: http://www.keil.com/support/man/docs/uv4/uv4_examples.htm
There are books here: http://www.keil.com/books/8051books.asp