Abstract: In this research, 100 military university students were tested with Rodand Frame Test, 15 subjects who had high scores and 15 subjects who had lowscores were divided into the field-dependent group and the field-independentgroup respectively, Each subject experienced a series of optokinetic step sti-mulation(5, 10, 15, 20, 30, 40, 60, 80, 100, 120 deg/sec). The latency and fuzzyestimate magnitude of the illusion were recorded. The main results are asfollow. 1. All the latency of the field-dependent group are longer than that ofthe field-independent group, The latency of the field-independent group de-creased linearly with the increase of stimulation velocity, While the field-de-pendent group decreased exponently. 2. Between 5-120 deg/sec, the fuzzy magnitude of the two groups regressedto two linear equations, The coefficient of two equations have no significantdifference, but the intercepts have significant difference. Consequently, the field-dependent/independent cognitive style is an im-portant factor that has influence on producing optokinetic illusion, It is veryhelpful for psychological selection and training of military pilots.

Key words: field dependence, cognitive style, optokinetic illusion