Objective To investigate the effects of adductor canal block (ACB) and femoral nerve block group (FNB) on analgesia and muscle strength after meniscus repair. Methods 60 patients with unilateral arthroscopic meniscus repair under subarachnoid block were selected. They were randomly divided into adductor canal block group, femoral nerve block group and subarachnoid block group with 20 cases in each group. In the ACB group and FNB group, ACB and FNB were guided by ultrasound before anesthesia, and the drug was 0.3% ropivacaine 15ml. NRS scale at rest and movement in postoperative 4, 8, 12, and 24 h, quadriceps muscle strength, additional analgesic dose and side effects were recorded. Results The NRS scores of SA group were significantly higher than those of ACB group and FNB group at each time point after operation (P＜0.05). There was no significant difference in NRS score between ACB group and FNB group. At 4, 8 and 12 h after operation, there was no significant difference in quadriceps muscle strength between SA group and ACB group, but significantly higher than FNB group (P＜0.05). There was no significant difference in muscle strength between the three groups at 24 hours after operation. The dosage of analgesics in the SA group was significantly higher than that in the ACB and FNB groups (P＜0.05), and the incidence of nausea and vomiting was higher than that in the ACB and FNB groups. Compared with ACB group, the operation time of nerve block in FNB group was shorter than that in ACB group, but there was no significant difference between the two groups and there were no obvious complications of nerve block. Conclusion Both FNB and ACB can provide good early postoperative analgesia, but the effect of ACB on quadriceps muscle strength is small, so that patients can perform postoperative functional exercise without pain, which is more conducive to the recovery of joint function.