According to reliability theory, probability distribution must be first understood to determine shear strength design values of metal-plate-connected joints. The authors conducted a shear strength test on five connecting angles of specimens composed of widely used domestic metal-plates and second grade SPF dimensional lumber from North America. The testing data were analyzed by distribution fitting methods combined with sum of squared residual analysis. The test results showed normal logarithmic shear strength distribution for the metal-plate-connected joints. Finally, using ratios of mean values and standard values, "K" were determined for reference for further analysis of reliability and determination of design values.