To facilitate users to access the desired information,many researches have dedicated to the Deep Web(i.e. Web data-bases) integration. We focus on query translation which is an im-portant part of the Deep Web integration. Our aim is to construct automatically a set of constraints mapping rules so that the system can translate the query from the integrated interface to the Web database interfaces based on them. We construct a concept hierar-chy for the attributes of the query interfaces,especially,store the synonyms and the types(e.g. Number,Text,etc.) for every concept. At the same time,we construct the data hierarchies for some con-cepts if necessary. Then we present an algorithm to generate the constraint mapping rules based on these hierarchies. The approach is suitable for the scalability of such application and can be ex-tended easily from one domain to another for its domain inde-pendent feature. The results of experiment show its effectiveness and efficiency.
