[Objective]:To analyze the clinical effect of four Cannulated Screws with rhomboid four-wall supporting internal fixation in the treatment of femoral neck fractures by comparison with three Cannulated Screws . [Methods]:A retrospective analysis was performed on 69 patients with femoral neck fractures admitted from January 2016 to December 2018. 33 patients were treated with closed reduction and internal fixation with four hollow nails supported by diamond wall internal fixation (four diamond fixation group), and 36 patients were treated with closed reduction and internal fixation with three hollow nails (three conventional fixation group).The basic indexes, clinical follow-up results and imaging evaluation indexes of the two groups were compared.[Results]:Basic indexes of two groups of patients with perioperative differences had no statistical significance (P> 0.05), The difference between the two groups of patients with fracture healing rate has no statistical significance (P> 0.05), The four diamond fixed group of patients with femoral head necrosis incidence rate and shortening of the femoral neck below three conventional fixed group, Harris scoring fine rate, and maximum hip flexion of hip flexion mobility degree is better than that of three conventional fixed group, postoperative follow-up of 6 months and at the end of the time neck stem Angle is better than that of three conventional fixed group, shortening of the femoral neck is less than three conventional fixed group,The difference between the two was statistically significant (P < 0.05). [Conclusion]:FourCannulated Screws with rhomboid support internal fixation for femoral neck fractures can effectively reduce the incidence of femoral neck shortening, reduce the incidence of femoral head necrosis, and enable patients to achieve better hip function.