Abstract: Objective: To study the curative effect of muscle-group resection of the malignant tumor in deltoid muscle and the reconstruction of stability and abduction function of the shoulder-joint, using latissimus-dorsi muscular flap displacement, and to evaluated and analyze the methods, results and clinical value of the surgical intervention. Methods: From January 1999 to August 2004, 8 cases with malignant tumor in deltoid muscle were treated with reconstructive surgery. The cases included 5 males and 3 females, with a mean age of 44.5 (25 to 64 years). The average time between onset of the symptom and diagnosis of the disease was 14 months (ranging 6 months to 3 years). The locations of tumor included 6 patients in left and 2 patients in right. The functions of shoulder joints were all evaluated pre-operatively and post-operatively, based on MTST evaluation system. The surgical procedure was resection of total deltoid muscle shoulder joint and reconstructed with transferred latissimus dorsi muscular flap, which with pedicle. Then fixed in 90°abduction and 30°anterior flexion for 6 weeks. All cases were followed up. The clinical results were evaluated pre-operatively and post-operatively. Results: All the cases were followed up for 6 months to 4 years (averaging 26 months) without tumor recurrence, all displaced muscle flap survived, with an average muscles power of grade Ⅳ to Ⅴ and the shoulder-joint abduction of 80 to 90 degree. Conclusion: Displacement of the excised deltoid muscle with vascular and neural pedicle latissimus dorsi muscle flap, after resection of total deltoid muscle, is an ideal operation method, and satisfactory results has been obtained.