Screen house study was to determined the best raw material of biochar for repairing the chemical properties of Ultisol and the growth of corn plants. This research using randomized block non factorial design with 5 treatments: control, rice straw biochar, oil palm empty fruit bunches biochar, durian bark biochar and cow manure biochar, with a dose of 50 g/pot and 4 replications. Parameters measured are pH, organic C, N-total, P-available, K-exchangeable, age of flowering, plant height, shoot dry weight, root dry weight, N, P, and K uptake. Result of this research showed that application of biochar can improve soil pH, organik C, N-total, P-available, K-exchangeable age of flowering, plant height, shoot dry weight, N and P uptake but it is not influence on increasing K uptake and root dry weight of corn plants. Cow manure biochar is better than the other biochar in increasing chemical properties of Ultisol and the growth of corn plants.