  We have developed an extended framework, named GR@PPA, of the GRACE system
for hadron collisions. The GRACE system is an automatic Feynman diagram
calculation system and an event generator based on this diagram calculation.
While the original GRACE system assumes that both the initial and final states
are well-defined, the GR@PPA framework applies that the initial and final
states parton configuration is treated in the Feynman diagram calculation at
the same time by putting one more integration variables. As a result, some
subprocesses with the same coupling order in hadron-hadron collisions can share
an identical "GRACE output code" and can be treated as a single subprocess.
This technique simplifies the program code and saves the computing time very
much. The constructed event generators would be suitable for the large scale
Monte Carlo production in the hadron colliders. In this paper, we discuss this
technique, and present some results and performances.
