<p>The impact force and trajectory stability of a body entering water at high speeds are crucial for safety. This paper first extracts the biological traits of the northern gannet that contribute to reduced impact force and enhanced trajectory stability. Inspired by these traits, a biomimetic body featuring a deflected cone nose is designed. Then, using the immersed boundary method by the Eulerian finite element method (EFEM), we simulate the body’s impact force and motion trajectory under varying nose deflection and initial attitude angles. Compared with conventional nose shapes like spherical or flat nose, the cone nose, mimicking the gannet’s beak, can prolong the impact duration, thereby reducing the initial peak force during water entry. Moreover, akin to how the gannet adjusts its neck for precise fishing, adjusting the cone nose’s deflection on the biomimetic body can result in a straighter trajectory and lower normal force. The optimal deflection angle is dependent upon the initial attitude angles. This study identifies an optimal parameter range for both the initial attitude and nose deflection angles, providing valuable insights for improving force reduction and stability.</p>