This paper is concerned with evaluation of subsurface shape of fatigue crack (FC) by eddy current testing (ECT). Since FC often remains tightly closed, it is difficult to identify deep-lying profiles by visual inspection. Our study is aimed at developing a practical method for detecting and characterizing the direction of crack growth from surface image obtained by scanning transmitter-receiver (TR) probe. A various type of fatigue cracks are made from compact tension (CT) specimen of aluminum alloy samples. The validity and feasibility of the proposed method are demonstrated by collecting data in our laboratory experiments.