Aiming at the status quo that a variety of noise interference was existing in the seam tracking process, seriously affecting the accurate extraction of weld location information, taking carbon steel plate butt welding as test object, weld position peak and crossing zero time were extracted by using pulsed eddy current nondestructive testing.On this basis,the system status optimal estimation method of kalman filtering was used to correct the welding center deviation.The results of welding test show that Kalman filtering 〖JP2〗algorithm can be used to effectively eliminate many noise disturbances, to optimize the pulse eddy extraction information, and to improve the stability of weld tracking.The theoretical analysis and experimental results are consistent, the feasibility of the method is verified.