Existing studies have shown that situational awareness is a key element affecting the search ability of operators. The design of interface information elements can influence the level of users’ situational awareness. Therefore, the rationality of the design of interface information elements under different situational awareness states becomes particularly important. This research is based on the actual design requirements. By formulating a three-dimensional enhancement scheme design and adopting the method of ergonomics experiments, taking the response time and task completion rate of the two stages of the target search task as indicators, it examines the influence of different interface information element design schemes on users’ search ability under three states of high, medium and low situational awareness. The experiment adopted an intra-group design of 3 (task scenarios: high, medium, and low situational awareness) × 2 (display schemes: original scheme and 3D enhancement), and the simulated environmental illuminance was 30lx. The target search task is divided into two stages: 1. The first stage: Observe the designated area on the situation map and click on the designated target. 2. Second stage: Based on the target’s movement speed and relative distance, complete the alarm level setting, and the task complexity increases in different situational awareness states. High situational awareness: Only the order in which the target enters the capacity range of this vessel needs to be judged. In the context awareness: Increase the distance threshold (set ≤ 50km as low alert, and > 50km as regular target). Low situational awareness: Combining distance and speed levels (three levels of speed + different distances trigger high and low alerts), and emergency handling is required. Finally, the Shapiro-Wilk test was used for the normality test. Repeated measures analysis of variance was used for the data conforming to the normal distribution (p > 0.05), and the Friedman non-parametric test was used for the non-normal data (p < 0.05). The results show that three-dimensional enhancement has a significant effect on enhancing situational awareness, especially in medium and low situational awareness scenarios, where it has a relatively significant effect. Specifically manifested as follows: In the second stage of the target search task, the task accuracy rate of the 3D enhancement scheme in the medium context awareness scenario is significantly higher than that of the original scheme, and the average task completion time of the 3D enhancement scheme in the medium context awareness and low context awareness scenarios is significantly lower than that of the original scheme. Therefore, proving the rationality of the design of interface information elements under different situational awareness states can effectively improve the search ability and task performance of operators. The research results can provide objective data basis for the design of interface information elements under different situational awareness states.