This study aims to determine the effect of swallow droppings and the best treatment of swallow droppings on pH, CEC, organic C, N-minerals and available P in Ultisols. The research method used was a one-factor Completely Randomized Design (CRD) with an incubation period of 2 weeks, with 5 types of treatment consisting of 1). Control without being given swallow droppings, 2). Swallow droppings 2.5 t ha^-1, 3). Swallow droppings 3 t ha^-1, 4). Swallow droppings 3.5 t ha^-1, 5). Swallow droppings 4 t ha^-1, each treatment was repeated 4 times, so that 20 experimental units were obtained. Parameters observed were soil pH (H₂O), soil CEC, soil organic C, soil mineral N, and soil available P. The results of this study indicate that the application of swallow droppings can affect pH, CEC, organic C, N-minerals and available P in ultisol soils. Giving swallow droppings 3.5 ton.ha^-1, significantly affected N-minerals (N-NH₄⁺ and N-NO₃^-) and also had an effect on other parameters, namely soil CEC, soil-available P, soil pH and C- soil organic.