Whether the MMN is the index of the automatic process of the brain is always a debate for the MMN research,it is also an important arguments to explain the mechanism of the MMN formation.In the previous experiments,less effort has been made to find an indicator to reflect the subtle fluctuate of attention resource on the health subjects.As regards to the experiments results from the attention deficit subjects,for participants under the situation of brain function defect is not clear so it cant be used to explain the phenomenon of the health subject.Aiming at clarify the relationship between MMN and attention,this paper investigates Cross-Modal Experimental Pattern to improve the experimental paradigm to achieve a better control of the health subjects attention resources.Meanwhile,the behavior data during the experiment were collected and fit with diffusion model.