Phchum Ben is one of the most important festival in Cambodia. People gather at pagoda to offer food, cake, drinks, money to monks to dedicate for their relative‘s death. This Traditional ceremny start 15 days from the first Photerbot to last 3 days in September, Cambodian people believe that ghosts and spirit are afraid of the light. that is why. the festival is help during the warning month when the ghost and sinful spirit are set free by the king of dead. during that time. the king of dead ascent to the earth to visit their alive relative. At their arrival. they search 7 pagodas that their relatives offer their foods to the monks. if they can not find food. they will get angry with their descendants and will curse and bother them throughout the year. so in the name of Khmer. we should go to the pagoda together.