Abstract: Local tooth shape error was created in the fabrication on threaded connections. It was one of the main factors that can affect the load distribution, deformation and therefore affect the connection quality. On the basis of elastic mechanics, an analytical model was established according with the geometric parameters of thread tooth. And the load distribution on threaded connections considering local tooth shape error was developed by making a mechanics analysis on each thread tooth. Taking P-110S cylindrical pipe threaded connection as a calculating example and considering the effect of different local tooth shape errors, the effects of tooth shape errors on load distribution at threaded connections are analyzed and some regular conclusions are obtained.