In order to solve the problem of existing spatial cardinal direction relation expression models which have disadvantage to capture imprecision and fuzziness, the fuzzy description logic and fuzzy rules are introduced into the expression of cardinal direction relation. Fuzzy rules based reasoning approach is proposed to strengthen of imprecision and fuzziness of processing and analyzing ability. In that way, the representing of fuzzy and crisp relations between fuzzy regions or crisp regions can be unified in one formal framework. In the implementa-tion, on the one hand, fuzzy rules are used to rewrite the existing spatial reasoning rule. All rules used in this paper are independent of spe-cific issues, that is to say, all the cardinal direction reasoning are using the same set of rules. On the other hand, the existing annotation of OWL2 is used to realize fuzzy ontology. No new label is extended into OWL2 language. Therefore, there is no need to develop a new rea-soning tool or plugin. There is also no need to prove the correctness of our approach. For reasoning about cardinal relations between fuzzy regions, some approximate methods are used. The experiment results show that the recall ratio of the results is 86.4% when two fuzzy re-gions are used.
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