This paper will discuss possibilities to create a digital library on traditional Mongolian script. Also we will introduce system architecture of a digital library that will store materials of historical importance written in traditional Mongolian which contain history of over 800 years. Specifically, we will propose a technique that will enable digital library system to allow users to search traditional Mongolian texts with keywords in modern Mongolian Cyrillic characters. To accomplish this goal, we will use Greenstone digital library system and it will be based on a traditional Mongolian dictionary.