Tie a knot at the fixed point of the fishing rod (twice, make the knot bigger).

Fold the top of the fishing line back about 8 cm and tie a knot (twice, tie a bigger knot to prevent tangency), and the line segments form a ring.

Tie another knot at the top of the ring.

Note: When fishing, put the knot at the end of the fishing line into a big knot, only part of it can be worn. Hold it in a ring by hand, put the short side of the fishing rod into the ring, and tighten the long side of the fishing line, so that the fishing line and the wheeled fishing rod are connected together. When you are free, pull the knot at the end of the fishing line and the fishing line will separate.