Based on 61 groups of conductance fluctuating signals in vertical upward oil-water two-phase flow，the relationship between chaotic attractor morphological characteristics and oil-water two-phase flow pattern transition was investigated by placing reference sections in the chaotic attractor field.The oil-in-water flow pattern was steadily distributed in the third-order and fourth-order attractor moment planes，while transitional flow pattern changed irregularly sharply in the third-order attractor moment plane，but changed linearly in the fourth-order attractor moment plane.The study showed that the chaotic attractor morphological of oil-water two-phase flow was sensitive to flow pattern transition，and it was helpful to understanding the nonlinear dynamic mechanism of oil-water flow pattern transition.