1. Take the wheat stalks to remove the joints at both ends to form a hollow tube, soak it in pure water overnight, wash it the next day, and cut it to the required length for use.
2. Soak the cropped straw straws with 1% salt water concentration for 1 hour.
3. Take out the soaked wheat straw, pour out most of the water, sterilize it at high temperature in an oven, and heat it to dry.