Mixed 2D/3D halide perovskites possess unique optoelectronic properties and strong structural stability, making them promising for various light-harvesting and -emitting applications. However, the long-chain organic cations have low charge conductivity and create potential barriers within the inorganic frameworks, which limit efficient exciton and carrier transport. In this study, we propose a method to improve exciton transport in 2D/3D perovskites by adjusting the conjugation interactions of long-chain ligands. Through time-resolved spectroscopy and high-resolution transmission electron microscopy, we establish the relationship between the microstructure of 2D/3D perovskites and exciton mobility. We successfully create a 2D/3D halide perovskite film with an exciton transport value of 92 cm