Abstract: The use of metal magnetic memory(MMM) technology for wind tower manufacturing weld, flanged connections at the working tower aims to find the stress concentration area according to the distribution characters of normal component of metal magnetic memory signals. The MMM techndogy is combined with the X-ray radiographic testing method to judge if the welding defects exist in stress concentration zone or not. Also, whether the reading on the torque wrench is less than the standard is used to judge the loosening state of the stress concentration zone bolts in the flange connection. Results show that it is feasible that the combination of MMM with X-ray testing is able to detect the manufacturing weld and its combination with torque wrench is able to detect the loosening bolts in the flange connection.