All engineered construction resting on the earth must be carried by some kind of interfacing element called a foundation. A type of foundation that has been recently widely used especially in high rise buildings is the combination of a raft foundation and a pile group which is known as piled raft foundation. In this type of foundation the load is carried by three elements of soil, pile group and raft and the role of all three is considered in bearing capacity. Regarding the connection between the pile group and the raft, piled rafts could be divided into two groups of connected piled raft system and disconnected piled raft system. In disconnected piled rafts there is no structural connection between the pile group and the raft and the piles are in fact used as soil reinforcement and settlement reducers. Many studies have been done on reducing differential settlements of piled rafts. However differential settlements are still one of the most challenging problems in designing this type of foundation. In the present study the effect of adding caps to pile heads in disconnected piled rafts as a suggestion for reducing differential settlement and improving the foundation operation is investigated. To do this investigation ABAQUS software and the finite element numerical method was used. The differential settlements of system under different load levels and in different stiffness and geometry conditions was studied using differential settlement curves. The effect of adding caps with various shapes on other important parameters such as average settlement and maximum bending moment of the raft was also studied. Cubic cap was introduced as a favorable shape of a cap. A sensitivity analysis was then done on some effective properties on piled raft with caps and the results were presented. The results showed that especially in smaller pile spacing adding caps to the pile heads could be a profitable suggestion for reducing differential settlements and consequently reducing bending moment of the raft. Keywords: Disconnected piled raft foundation, finite element method, differential settlement, load-settlement curve, maximum bending moment