Objective To evaluate a 3-year mid-term clinical results of FAST-FIX suture system in arthroscopic meniscal posterior horn repair. Methods Clinical results of 46 patients with meniscal tear who underwent posterior horn of the meniscus repair using the FAST-FIX suture system from January 2011 to April 2013 were retrospectively analyzed. There were 27 males and 19 females,age 17~42 years old,average 23.5±8.22 years old. There were 25 left knee and 21 right knee and 33 red zone injury and 13 red-white zone injury, 8 of which were accompanied by anterior cruciate ligament injury. Clinical healing of the meniscus was assessed by Lysholm scores(35.73±11.28)points,IKDC scores(37.26±13.17)points and Tegner scores(3.3±1.7)points before operation. Results The average follow-up period was 46.3 months (range: 36-59 months). The clinical healing rate was 91.3%. Healing failure occurred to 4 patients and 2 of which had a meniscus noose after operation and were confirmed surgical failure in reoperation. Mean Lysholm scores were (86.31±11.89),IKDC scores(82.9±13.44)and Tegner scores(5.9±1.9)in 3 years after operation for all 46 cases. The differences between the preoperative and postoperative scores in three type scores were statistically significant (P<0.05). Conclusion Arthroscopic posterior horn of the meniscus repair with the FAST-FIX suture system may provide good 3-year mid-term clinical results after operation.