Abstract: This paper presents data structure of Bangla Dictionary. Bangla words have three basic units, prefix, root and suffix. As Bangla is a very inflectional language, many words can be formed from a single root with different prefix and suffix modifier. In this research we have designed new data structure using trie structure for Bangla dictionary. This proposed model can represent the Bangla word efficiently. We have created some algorithms to find the suffixes, prefixes and the root word and their corresponding meaning and tag.