This paper summarizes the results of in-plane cyclic tests of three steel-plate composite(SC) walls with boundary elements. The tests were executed in a laboratory at the National Center for Research on Earthquake Engineering(NCREE) in Taiwan. Thick steel plates were used as boundary elements of five specimens. To study two kinds of failure modes, we included in the test 1) four shear-critical walls with aspect ratios of 0.75 and 1.04 and a thicknesses of 3 cm and 5 cm for boundary elements; and 2) one flexure-critical wall with an aspect ratio of 1.22 and a thickness of 2 cm for boundary elements. The failure mode and cyclic behavior of each specimen are reported. The test results are compared with the recommendations of AISC N690s1 and predictions of selected literature data. The impact of wall aspect ratio on in-plane shear strength of SC walls with boundary elements is discussed.