Photocatalytic hydrogen evolution reaction (HER) faces challenges due to inefficient charge transfer, limited active sites, and water activation difficulties. Effective manipulation of the dipole polarization electric field offers a solution to overcome these obstacles. Herein, the introduction of highly electronegative element N into the ZnCdS (ZCS) structure increased the dipole moment from 2.58 to 3.35 eÅ via a one-step solvothermal method. The increased dipole moment generates a spontaneous polarization field within the photocatalyst, promoting directed charge migration and enhancing H2 evolution efficiency. Through a combination of comprehensive experimental and theoretical analyses, we confirm that the introduction of N induces a dipole polarization electric field in ZCS, decreases the distance between H2O and the active site N, and reduces the HER energy barrier. Consequently, the best performing catalyst ZCS-TETA-8 demonstrates significantly improved activity of 115.7 mmol/g/h and maintains stability over 5 cycles. This work provides a new strategy for developing efficient HER catalysts.