First float can be used to test the water depth, current for accordingly adjusted the line length, decided to measure or lie the catch.

Float by changing it and the distance of the hook, to hook positioning, decided to bait the hook is suspended in the water or lie in the bottom.

Second float allows fishermen know the location of the hook, can judge set on the base of the bait is cast, if not, can change in time, in order to improve the rate of fish.

Finally float is fishermen's "eyes", that is, through the various dynamic float, which can determine the size of the fish, varieties, can also grasp the fish bites the hook, in order to mention pole in time, will the fish catch up.