As the only still used pictographs in the world, NaXi pictographs has been used in computer information processing. However, the technology of processing minority scripts hasn't been applied on mobile platform. Using Eclipse, this paper has developed a NaXi Pictographs Mobile Phone Dictionary Based on J2ME. Via Fast Searching Algorithm of Trie tree, we achieved the goal of NaXi-Chinese query and online update of the lexicon. To the problem of display NaXi pictographs on the MT (Mobile Terminal), we extracted matrix font of NaXi pictographs. The realization of NaXi Pictographs Mobile Phone Dictionary drew a new page on the history of information processing on Chinese minority scripts mobile, as well as a great reference for information processing on other minority scripts.