The present study examines the strength of a single layer latticed dome having semi-rigid joints by the following tests and analysis. Each member in the dome is composed of a tubular member, ball joints and connecters. First, the loading tests to screw-type ball joints were performed to obtain its mechanical behavior, initial rigidity and ultimate strength as a joint. Secondly, the loading tests to a single layer latticed dome, having the same joints as in the tests of joints, were conducted and compared with the elasto-plastic analysis of dome based on the rigidity and strength decided by the tests of joints. Since the measured values of experiment were fairly in agreement with the values of analysis, the present analysis of dome with elastic-plastic springs at both ends of members may be applied to estimate buckling behaviors of domes composed of semirigid joints for a practical use.