In order to study the flutter of long-span pedestrian suspension bridge and its aerodynamic control. a 420m-span pedestrian suspension bridge is used as an engineering example. the wind-induced vibration of seven particular aerodynamic sections is studied by wind tunnel tests. and the soft flutter phenomenon of two kinds of aerodynamic sections is identified. https://www.roneverhart.com/HP-Notebook-15-da0008ca-HD-LED-15-6-Touchscreen-Intel-Core-i5-8250U-1-6-GHz-8-GB-RAM-1-TB-SSD-HDMI-USB-Multi-format-S/