Pitra Yadnya Ceremony is a religious ceremony that is frequently held by Hindunese in Bali, which is an offering and a worship to the Ancestors. In Pitra Yadnya Ceremony, many steps, upakara and other ceremony requirement are used. These days many people doesn't quite understand about the meaning of the ceremony. the steps and upakara of Pitra Yadnya Ceremony. This is caused by the lack of information and also, complete literature about ceremony, ceremony steps and upakara Pitra Yadnya Ceremony that is quite hard to get. So it is needed to build a system to make people search information easier, one of the ways is to build a web based Pitra Yadnya Ceremony Information System. The design of information system is done by modeling it using the tree method. In addition a modeling using normalitation technique is also being used. The analysis is applied after the application uploaded to the internet, tree analysis including user interface analysis, data growth analysis, and system feasibility analysis. The data growth that will occur is not too big because the ceremony, ceremony steps and upakara data won't change significantly from time to time. So the application program made can still run well and the people can easily gain information about pitra yadnya ceremony where-ever they are. Information completion can be improved by researching which yield information of picture and video.