Rice (Oryza sativa L.) is the most important food crop in Taiwan, and its pedigree data is invaluable for further crop improvement and genetic studies. Here we described the development of a pedigree database, searchable through Internet and the use of a web browser, containing pedigree records on varieties and half of the breeding lines developed between 1981 and 1997. Functionality of calculating Coefficient of Coancestry was also provided to facilitating selecting parents in a breeding program.