According to the finite element simulation of some two-span space continuous composite truss bridge, the paper analyzes the effective distraction width of the bridge floor under the uniform loading and the concentrated load, explores the changes in some parameter, such as the width-span ratio, the thickness of bridge deck, the high-span ratio, the longitudinal and transverse distance of joints, compares the Chinese ef- fective distribution width coefficient with the one of other countries, and concludes the law for the effective distribution width of the space contin- uous composite truss.%通过对某两跨空间连续组合桁架梁桥的有限元模拟，分析了均布荷载和集中荷载作用下该桥面有效分布宽度，继而探讨了宽跨比、桥面板厚度、高跨比，以及节点纵、横桥向间距等参数变化对桥面板有效分布宽度的影响，最后与各国规范进行有效分布宽度系数的对比，得出空间连续组合桁架梁有效分布宽度的规律。
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