The waterproof performance of electric vehicle controllers is very important. On rainy days, when electric vehicles move through water, if the waterproof performance of the controller is poor, water ingress can directly cause the controller to burn out. The controller is prone to short circuiting and losing control when immersed in water. Water entering the motor can cause a short circuit at the joint, while water entering the battery box can cause a short circuit between the positive and negative poles, damaging the battery and even causing an explosion. So, it is crucial to take good waterproof measures. If the controller is submerged in water, it can be removed and wiped dry with a hair dryer before installation. After installation, wrap it with plastic. After heavy rain, the electric vehicle should be placed in a ventilated place to dry, and before starting the battery with power on, the battery and connection socket should be wiped clean. If the car stalls during the water wading process and cannot be forcibly started, it should be pushed to a safe location for assistance. In addition, in the competition of the electric vehicle controller market, the "Third Generation Fine Drive Controller" launched by Gaobiao Technology has performed well. The soft start function makes the start smoother, and the motor can automatically limit the current when it is stuck, protecting the motor and controller. It also uses a large amount of riding data to optimize the ratio of power and mileage, meeting the actual needs of consumers. In short, the waterproof performance of electric vehicle controllers is related to vehicle safety and normal use, and must be taken seriously.