<p>Fracturing stimulation serves as a vital technique for enhancing unconventional reservoir development, where limited-entry fracturing (LEF) plays a critical role in achieving uniform cluster activation. However, uneven fluid distribution among clusters often leads to limited effective fractures and imbalanced production profiles, severely compromising reservoir productivity. To address these challenges, this study proposes an optimization method for perforation density in LEF, aiming to improve injection-production balance along horizontal wellbores. A coupled flow model integrating fracturing fluid injection and production phases is established, incorporating reservoir heterogeneity and perforation erosion effects. Field case analysis reveals that conventional uniform perforation schemes preferentially allocate fracturing fluid to heel-end clusters, causing localized over-fracturing while leaving toe-end clusters under-stimulated. Perforation erosion significantly enlarges hole diameter and discharge coefficients, reduces perforation friction, and exacerbates uneven fluid distribution and fracture propagation. To achieve injection-production balance, the equivalent perforation diameter should progressively increase from heel to toe. Under fixed hole diameters, this necessitates variable perforation density. After optimization using the proposed method, the coefficient of variation (CV) of fracturing fluid injection rates along horizontal wellbores decreases from 19.45% to 4.27%, while the CV of production fluid rates across stages reduces from 22.6% to 7.53%, demonstrating method effectiveness. This study provides theoretical guidance for designing perforation schemes in limited-entry fracturing operations.</p>