The efficiency of the adhesion and growth of Ulva Prolifera in 3 kinds of ropes with different materials and 5 different coatings was studied in the methods of outdoor simulation experiments.The results showed that the density and length of green tide algae seedlings on the 3 kinds of ropes increased as time went on, and around 4 weeks, the density of fixation reached the maximum, and then showed a downward trend.From the material point of view, the average growth length of green algae seedlings on polypropylene rope was slightly longer than those of other 2 kinds of materials.The selected coatings can effectively inhibit the germination and growth of green tide algae. The coated ropes fixed number of green tide algae seedlings and growth length were significantly lower than the control group.The organic fluorine coating had the best effect on preventing.