Radiofrequency (RF) coils are a critical component of Magnetic resonance imaging (MRI) systems and their performance directly affects the magnetic field strength and uniformity. To quantitatively analyze the impact of coil structure on B1+ field performance, this study simulated 125 different coil models with varying rung widths, end ring widths and end ring spacing, then calculated the B1+ field uniformity within the axial central region based on field strength measurements in that area. The results indicate that the rung width of the coil has a significant impact on the B1+ field strength, with an increase in rung width effectively enhancing the field strength in the B1+ field central region. The simulation results of all coils effectively simulate the distribution of electric and magnetic fields along the z-axis central direction, demonstrating good circular polarization efficiency and uniformity. This study provides theoretical support for the optimization of RF coil structures and is of great significance for improving MRI imaging efficiency and uniformity.