A fan, which has a downrod and a motor fixed at the bottom of the downrod; the motor drives a rotating disc, and a plurality of mounting brackets are installed on the rotating disc, which can swing up and down in the vertical direction with the connection with the rotating disk as a shaft; the outer end of the mounting bracket can be rotatably installed with a blade, the blade and the mounting bracket can swing up and down in the vertical direction as a whole so as to be adjusted to the most balanced position, canceling the vibration caused by the installation and weight error of the blade, and carry out internal self-regulation, so it can reduce the overall shaking; the blade does not have an upwarped part, and there is a certain distance between the adjacent two blades, which will not cover and overlap.