Abstract: The measurement systems of welding current, voltage, temperature, deformation and the residual stresses were introduced. Butt welding program of twin-wire submerged arc welding of thick A105 steel plate were designed. During welding, welding current, voltage, temperature, deformation and the residual stresses were measured by using measurement systems. The stability and reliability of measurement systems were proved. The results show that single power source twin-wire submerged arc welding, which is one of alternative methods of submerged arc welding with high deposition rate and low heat input, can meet manufacturing requirements of lange diameter full welding ball-valve. The measurement systems are stable and the results of current, voltage, temperature, deformation can be obtained by real-time dynamic measurement in welding process and the measurement of residual stress after welding provide experimental judgment for appropriate design of valve' s structure.