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In this study, totally 60 full-sized specimens were made and tested under monotonic loading in order to afford the data for a reasonable and economical design of grout-filled splice sleeve. The experimental variables adopted in this study were embedment length of reinforcing bars, compressive strength of filled mortar and size of reinforcing bars. After test was performed, the results were compared and analyzed along with previous test of author. The followings were found: 1) It is verified that the tensile strength required in ACI and domestic code is maintained either when the embedment length of reinforcing bars over 4.2d is used with compressive strength of mortar over 700kgf/cm2 or when the embedment length of reinforcing bars over 4.7d is used with compressive strength of mortar over 600kgf/cm2. 2) It is verified that over 2% ductility is maintained either when the embedment length of reinforcing bars over 4.2d is used with compressive strength of mortar over 700kgf/cm2 or when the embedment length of reinforcing bars over 5.2d is used with compressive strength of mortar over 600kgf/cm2. 3) Splice sleeve which are designed to maintain the embedment length of reinforcing bars over 6.5d are conservative in respect of tensile strength and ductility. When splice sleeve are produced anew, it is considered that the more economical splice sleeve which reduce the length of splice sleeve can be made.