A method of determining brittle crack propagation arrestability of a high-strength steel plate, comprising the steps of: performing a large-scale test and a composite small-scale test using standard steel; calculating a correlation model between a result of the large-scale test and a result of the composite small-scale test obtained using the standard steel; performing the composite small-scale test using a steel specimen; and estimating the brittle crack propagation arrestability of the steel specimen by substituting the result of the composite small-scale test using the steel specimen into the correlation model, wherein the large-scale test is one of an ESSO test and a double tension test, and the composite small-scale test includes the sub steps of: (a) collecting a surface-small-scale-test-piece including a surface part of a steel plate; (b) collecting one or more inner-small-scale-test-pieces from one or more inner regions that do not include the surface part of the steel plate; (c) performing a NRL drop weight test defined in E208-06 of the ASTM (Standards of American Society for Testing and Materials) using the surface-small-scale-test-piece; and (d) performing, using the inner-small-scale-test-pieces, one of a chevron-notch Charpy impact test, a V-notch Charpy impact test, a sharp-notch Charpy impact test, a pressed-notch Charpy impact test, a pre-cracked Charpy impact test, a three-face sharp-notch Charpy impact test, and a U-notch Charpy impact test. performing a large-scale test and a composite small-scale test using standard steel; calculating a correlation model between a result of the large-scale test and a result of the composite small-scale test obtained using the standard steel; performing the composite small-scale test using a steel specimen; and estimating the brittle crack propagation arrestability of the steel specimen by substituting the result of the composite small-scale test using the steel specimen into the correlation model, wherein the large-scale test is one of an ESSO test and a double tension test, and the composite small-scale test includes the sub steps of: (a) collecting a surface-small-scale-test-piece including a surface part of a steel plate; (b) collecting one or more inner-small-scale-test-pieces from one or more inner regions that do not include the surface part of the steel plate; (c) performing a NRL drop weight test defined in E208-06 of the ASTM (Standards of American Society for Testing and Materials) using the surface-small-scale-test-piece; and (d) performing, using the inner-small-scale-test-pieces, one of a chevron-notch Charpy impact test, a V-notch Charpy impact test, a sharp-notch Charpy impact test, a pressed-notch Charpy impact test, a pre-cracked Charpy impact test, a three-face sharp-notch Charpy impact test, and a U-notch Charpy impact test. (a) collecting a surface-small-scale-test-piece including a surface part of a steel plate; (b) collecting one or more inner-small-scale-test-pieces from one or more inner regions that do not include the surface part of the steel plate; (c) performing a NRL drop weight test defined in E208-06 of the ASTM (Standards of American Society for Testing and Materials) using the surface-small-scale-test-piece; and (d) performing, using the inner-small-scale-test-pieces, one of a chevron-notch Charpy impact test, a V-notch Charpy impact test, a sharp-notch Charpy impact test, a pressed-notch Charpy impact test, a pre-cracked Charpy impact test, a three-face sharp-notch Charpy impact test, and a U-notch Charpy impact test.