Well, it looked OK in the Preview!
(at least you know what all the HTML tags look like now!)

Let's just try that again:
<hr>
I'm not quite sure what you're asking:

Do you mean you want to jump from assembler to your 'C' program?
Or do you want to insert an "LJMP 000h" instruction into your 'C' program.

"got error in compiling"

OK, what error did you get?
Please show a code excerpt, and the full error message (including the error number)

When posting the code, remember to enclose it within the HTML < pre > and < /pre > tags - then it'll format properly.
(but don't use the extra spaces like I just did - that was just so you could see the actual tags!)

When debugging error messages, remember that you must always resolve the first message first, before moving on to subsequent messages - as one error will often cause more errors later in the file!

Have you read the section "Interfacing C Programs to Assembler" in the Keil C51 manual, and the section "Interfacing to Assembly" in the Getting Started with µVision2 manual?