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Steering law has been a robust and powerful model for studying steering tasks in human-computer interaction.In this paper, the effect of four kinds of steering direction (leftward, rightward, upward and downward) on human performance in straight steering tasks has been investigated.Experimental results showed that the steering law still held for all of the four kinds of steering direction in straight steering.There was significant difference of the value of SD (Standard Deviation) among the four kinds of steering direction in the straight steering task.Vertical steering resulted in more SD than horizontal steering.These results will be useful for further research and experiment design.