The goal of this study is to review on the previous studies of mechanical behaviors of traditional wood to wood connections. The load carrying capacity of various types of wood to wood connections was investigated. The highest load carrying capacity of 26.67kN was found from goose neck connection, whereas the lowest load carrying capacity of 0.82kN was found from end lap connection. Comparing the moment carrying capacity of dovetail and sagae joints, the sagae joint showed a higher moment value. However, the direct comparison from the different wood to wood connections was limited due to the different size, species, geometry of tenon and mortise, and different testing methodologies. To apply the wood to wood connection to the modern buildings, optimized geometries of tenon and mortise for the wood to wood connection should be established to obtain the highest structural performance. Also, standardized testing methodologies should be used to accumulate the structural design data.