The study on Indigenous Knowledge of Tribals of Pachaimalai hills, was conducted to study about adopting indigenous agricultural practices followed by tribal farmers in Pachaimalai hills in Trichy district of Tamilnadu. A sample of one hundred tribal farmers (respondents) was selected from the tribal hamlets using proportionate random sampling technique. Nearly twenty one indigenous agricultural practiceswere identified in the crops like paddy, tapioca and sorghum. In addition ten common indigenous agricultural practices were also identified. The data were collected with the help of well structured and pretested interview schedule and suitable statistical tools were used to analyse the data. Sixty to ninety percent of the respondents have been adopting almost all the identified indigenous agricultural practices