The basic theory of seismic refraction and one of the most popular refraction methods- plus-minus are elaborated. Despite of the limitations of plus-minus method, such as can only deal with single interface model with inclination angle smaller than 10 degrees and efﬁcient only in "analyze window", researchers beneﬁt by its convenience to roughly explore the subsurface structure and acquire signiﬁcant information of layers. This pragmatic method is realized in Matlab as a graphical user interface (GUI), as a more approachable tool for beginners. From ﬁnite difference model and ﬁeld data tests, usability of the tool is proved.
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