With the exploitation of the offshore oil and gas,in order to satisfy the increasingly functional demands for the automatic welding equipment of the marine pipeline laying,a human-machine system is designed with the ADS communication as the data exchange mode. Within the system,Twin CAT is the control core,which employs C# language to realize the design and programming of the humanmachine interaction,and exchanges data with Twin CAT system through ADS communication method. The human-machine system enables the task setting and real-time data display of welding process,the independent setting and real-time storage of the welding control parameters and the partition parameters,and the rendering of the dynamic curve to show the change of parameters intuitively. Experiments showed that the human-machine system has the advantages of simple and easy to operate,high real-time ability,and strong data processing ability.