The date palm tree is one of the most sacred and ancient trees for humans, and all its parts are useful. The present study was conducted with the aim of achieving various functions of the date tree. Our study area is Jam-o-Riz County in Bushehr Province. In the present study, a qualitative approach and ethnographic method were used to collect information. Data collection techniques also include observation and in-depth interviews. The researcher has also lived in the research field for many years and is fully familiar with it. The subject of the present study is ethnography. In this research, the use of date palm in the culture of the people of southern Iran is recounted and described in terms of food, handicrafts, ceremonies, architecture, recreation and leisure, beliefs and convictions. Research findings indicate that the functions of the date palm tree can be divided into three categories according to its components: 1- Leaves including: weaving mats, bread baskets, hats, blowing the wind, date sacks, brooms, medicinal, animal feed, decorative, fire, roofs of houses and date baskets, 2- Fruit (flowers, unripe fruit, fresh date, dates) including: edible, medicinal, recreational, water musk, date paste and date tree cheese and 3- Trunk including: making seesaws, roofs of houses, fuel, making ropes, date tree cheese and parvang (a tool for climbing the date tree). The date palm tree has been linked to the lives of the people of this land since the moment of birth and is with them until death; an example of which can be seen in the donation of gardens by some people of this region for forgiveness and the remnants of the righteous. This tree has entered and accompanied the people in their joy and sacred ceremonies such as marriage, and it also accompanies them in mourning ceremonies.