Net shape is an important indicator of the operative performance of tuna purse seine, and can be affected by many factors, such as twine material, leadline weight, fishing operation, and currents. In order to understand the effect of shooting pattern and current speed on the shape of tuna purse seine, a model net was manufactured from the prototype net used by Chinese tuna purse seiners, based on the Tauti law. The experiment was carried out in the circulating tank at Nichimo Co., Ltd. of the Shimonoseki Research Institute. The effects of three shooting patterns (front set, cross set, and back set) and three current speeds (0 cm/s, 5 cm/s, and 8 cm/s) on the shape of the model net (the sinking depth of the leadline, the profile of the net, the opening surrounding the areas of the floatline and leadline, and the shape of the floatline and leadline) were investigated in this study. The results showed that:(1) when the current speed was 0 cm/s, the sinking depth of the leadline, and the opening area surrounded by the floatline and leadline reached the maximum of 1.21 m, 8.44 m², and 9.89 m², while the net maintained a better shape; (2) when the current speed was 5 cm/s at the front set, the shapes of floatline and leadline were better compared with the other experimental conditions; (3) at the front set and back set, the sinking depth of the leadline decreased with increasing current speed (1.21 m for the front set and 1.21 m for the back set at 0 cm/s > 1.17 m for the front set and 1.16 m for the back set at 5 cm/s > 1.13 m for the front set and 1.10 m for the back set at 8 cm/s), and the sinking depth of the leadline significantly differed with current speed (<0.05); (4) at the cross set, there was no significant difference in the sinking depth of the leadline for different current speeds (>0.05); (5) for each shooting pattern, current speed did not significantly affect the initial opening areas surrounding the floatline and leadline (>0.05); (6) the opening areas surrounding the floatline and leadline had a linear relationship with the square of time (<0.05). Based on the above results, we recommend cross set in practice, because it ensures a better shape of the net and a greater sinking depth of the leadline.