Abstract: Target identification for weapon equipment in human machine interface design must to be settled through the research of experiments and assessments. A target identification experiment of multi-interface and multi-task was developed, according to tasks what pilot need to operate during flying. This work investigated how human identify target color, figure and location under different task weight by measuring response time and detection rate what participator react to main task to provide standards for target code in human machine interface design. Result indicates that green, red and triangle are the fit code for target in interface design and square and circular necessarily can be made as the target code under the need of attention allocation, no matter what task weight is; it is indispensable to take task weight into account in designing target location for human interface, as target identification of different location is affected by the task weight.