To understand the flutter and vortex-induced vibration(VIV) performance of the bridge deck with double-slots and to propose feasible control measures, a sectional wind tunnel test was carried out based on a steel-box suspension bridge which was been planned. Afterwards, 2d-3DOF method and CFD simulation were introduced respectively to understand flutter and VIV mechanisms. The results show that, double-slotting is an effective method to improve the flutter performance of a steel-box deck. According to this section, the type of railings, with or without pedestal, influences the critical wind speed significantly. Besides, central stabilizer, as a conventional control alternative, also has a positive impact on bridge’s stability. In a certain range of height, the section with a higher plate will perform better. As is shown by 2d-3DOF method, both central stabilizer and optimized railing can slow down the increasing of aerodynamic damping with wind speed. Since VIV often occurs with a slotting deck, various measures have been taken into account in the test, while the equidistant grating is proved to be more efficacious. By CFD simulation, the essential  mechanism is that grating changes the flow field notably, avoiding large-scale vortex shedding.