Abstract: Behaviors such as interface failure and contact widely exist in refined simulations of structural failure, progressive collapse and foundation-soil interaction. As a novel numerical method, the finite particle method (FPM) is well adapted to structural analyses of strong nonlinear behaviors, with the advantage of improving computational efficiency through parallel computing. These merits make it possible for FPM to conduct fine interface simulations at a lower cost. A universal triangular interface element is proposed in the parallelized FPM framework for simulating interface behaviors such as bonding, cracking and contact. The parallel strategy for the interaction-pair search is introduced first. Then, the state criterion and mechanical models of three types of interface behaviors, namely the acceleration-based interface bonding, the cohesive-zone-based interface cracking and the penalty-based interface contact, are discussed. Using a self-developed universal computational platform of FPM, numerical tests of interface behaviors of this interface element are conducted to validate its accuracy and effectiveness.