  We describe the present status of the computing system in the Belle
experiment at the KEKB $e^+e^-$ asymmetric-energy collider. So far, we have
logged more than 160 fb$^{-1}$ of data, corresponding to the world's largest
data sample of 170M $B\bar{B}$ pairs at the $\Upsilon(4S)$ energy region. A
large amount of event data has to be processed to produce an analysis event
sample in a timely fashion. In addition, Monte Carlo events have to be created
to control systematic errors accurately. This requires stable and efficient
usage of computing resources. Here we review our computing model and then
describe how we efficiently proceed DST/MC productions in our system.
