Abstract: Correctness of seismic data interpretation straightly affects the results and precision about reservoir prediction in exploration.As a sort of assistant means,balanced section interpretation makes multifarious-results of seismic-interpretation restricted and brazes a way in its quantitative analysis.This paper gives a presentation of fundamental and interpretation-mechanism about cross-section technique,expatiates background of and specially introduces application in seismic data interpretation and some problems at present.Briefly speaking,cross-section technique has widely developing foreground.