SMART System and Okapi System are t

SMART System and Okapi System are two
distinguished information retrieval (IR) systems.
The former one uses Vector Space Model and the
later one uses probabilistic retrieval strategy. A
lot of previous research of information retrieval
was carried out on these two systems, whch
showed that both of them were effective in IR. In
this payer, we carry out a series of experiments
on TREC-9 collections to discuss the different
performance between these two kinds of retrieval
systems in Chinese information retrieval. Our
experimental results show that the performance
of Okapi System is better than that of SMART
System in some degree.
Introduction
Today, with the emergence of digital libraries and drool