ETL(Extract-Transform-Load) is an indispensable component of the NC machine sensor data analysis. In view of the increasing amount of data in recent years, and the rising requirements for real-time data processing, this paper improves the traditional change data capture methods, and designs real-time data capture solutions based on the characteristics of those data. What's more, it details the entire ETL distributed architecture design. Finally, experiments show that the ETL system on NC machine sensor data real-time processing has higher efficiency.