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Objective:To investigate the blood supply pattern and characteristics of bilobate anterolateral thigh flaps, and to summarize the clinical experience.Methods:Date of 102 cases of limb wounds repaired by bilateral anterolateral thigh perforator flaps from March 2014 to July 2019 were retrospectively analyzed. There were 80 males and 22 females with an average age of 40.7 years (range, 9-66 years). All of the patients suffered from limb trauma with complex tissue defects, among which 29 cases had two adjacent and discontinuous wound surfaces on the same limb, and the area ranged from 5 cm×5 cm to 30 cm×18 cm, while the other 73 cases remained a single wound with the area ranged from 12 cm×11 cm to 27 cm×15 cm. Ultrasonic Doppler was used to locate the perforating branches. According to different patterns of blood supply, flaps of different types were designed and applied respectively. For those who with perforating branches of common trunk type or fascial type, the wound surface can be covered by the flap directly; for those who with perforating branches of double trunks type or mixed type, the turbocharging technique was performed after dissection of the pedicles of the flap, while the wound was repaired by reconnection. All the donor sites were sutured directly.Results:Total of 105 bilobed flaps were designed in 102 patients, including 43 flaps of common trunk type, 30 flaps of double trunks type, 24 flaps of fascial type and 8 flaps of mixed type. The single harvested flap area ranged from 6 cm×5 cm to 20 cm×9 cm. One patient's one piece of the bilobed flap repairing two wounds suffered an arterial crisis at 17 h after surgery. The surgery confirmed there was an intractable arterial spasm and the crisis was relieved after a vein trans-plantation. Then about 4 cm×3 cm superficial necrosis appeared in the most distal part of the flap and healed in secondary after dressing changes. Two cases with single wounds suffered from a vein crisis at 48 h after operation. After removing the suture and blood letting, the flaps survived a week later. The average healing time was 19 days (range, 8-83 days). All the thigh donor sites healed by first stage. All the cases were followed-up for an average period of 16 month (range, 6-70 months). The latest follow-up showed that the flaps were of good color and texture, and the sensation of the flaps recovered partially. According to the British Medical Research Council sensory rating scale: 21 cases were grade S2 and 81 cases were grade S3. According to the revascularization assessments of digital replantation standard by Hand Surgery Branch of Chinese Medical Association, the results were excellent in 91 cases, good in 11 cases, with excellent and good rate of 100%. Linear scars were left in most donor sites and the VAS scores were all zero. 5 cases had a large scar area which the width was more than 3 cm, but there was no scar contracture or pain. 9 cases had an abnormal sensation in the donor area in the early stage and recovered gradually 3 months later without any movement disorder.Conclusion:The use of the bilobed anterolateral femoral perforator flap with different blood supply patterns to repair the wounds of extremities could overcome the lack or deficiency of blood supply caused by perforators with different sources. To clarify the blood supply types is conducive to the flap cutting and leaf splitting during the operation, which greatly improves the survival rate of the flap.