In multi-signal flow graphs model

tests can be carried at the same time which detect the same signal or need the same stimuli.Based on this

test can be grouped.The sequence of test can be decided by the probability of fault conclusion detected by these test groups in the course of fault isolation.As a result

a fault isolation algorithm based on tests partition is proposed.With this algorithm

test time can be decreased as much as possible.Meanwhile fault probability and the increase of minimal test hardware are taken into consideration.