Abstract: The control method and logic of the vehicle total wind pressure on Guangzhou metro Line 7, together with the low traction and blockade faults are analyzed, defects in the control logic are pointed out. According to the causes for abnormal triggering of the total wind low pressure which leads to traction blockage fault, and the existing defects in the control logic at the initial stage of train power-on, an improved plan is proposed, aiming at avoiding the traction blockage caused by the total wind low pressure.