Blocked and random hierarchical processing tasks are used to investigate hemispheric asymmetry effects under different attention filtering condition and to examine how attention filtering mechanism、perceptual conflict and response conflict factors modulate the hemispheric asymmetry effects as well.

The paper introduces some attention theories and lists some demonstrations to prove the feasibility of these theories,so as to show the practical significance of these theories and their influence on second language acquisition.

By the forms of questionnaire and interview, the attention theory is inducted to the Chinese-teaching class for oversea students, in order to educe a series of concrete suggestions and methods which are conductive to this kind of class, making students concentrate in learning content most effectively.