The findings of this study have significant practical implications for the field of biosystems engineering. Understanding the movement and distribution patterns of insects is crucial for developing effective stored grain management protocols. This research investigates the three-dimensional movement and distribution of Tribolium castaneum and Cryptolestes ferrugineus separately at different temperatures (5, 10, 20, and 30⁰C) and for different movement periods (1, 2, 3, and 24 h) in stored wheat with a uniform moisture content of 14.5% (wet basis). The experiments were conducted in a wooden container with internal dimensions of 0.7 × 0.7 × 0.7 m. The wheat was filled into 343 mesh cubes (referred to as cube), each measuring 0.1 × 0.1 × 0.1 m, arranged in seven layers after being loaded into the container. One hundred insects were introduced into the centre cube (also the centre of the container) at the start of the experiment. After the desired movement period, the cubes were removed, wrapped in labelled plastic bags, and sieved, and the insects were recovered and counted. Results indicated that both species exhibited movement speeds > 7.2 m/d in vertical and horizontal directions at higher temperatures (20 and 30⁰C). At lower temperatures (5 and 10⁰C), their vertical speed was higher than their horizontal speed. Tribolium castaneum ceased movement at 5⁰C, whereas approximately 13% of C. ferrugineus adults continued to move at this temperature. The drift effect and geotaxis influenced the movement and distribution of both species in the vertical direction, while their horizontal movement followed a diffusion pattern. These findings will contribute to developing more effective and targeted pest control strategies in stored grain management.