Driven by German “Industry 4.0” and “Made in China 2025”,the probe is more and more popular in automated development application.The risks of the probe in the automatic machining measurement process of Siemens CNC machine tools were analyzed.Aiming at the problem that the probe has no anti-collision and anti-rotation protection in the process of measurement application,the improvement strategy and solution which combined with NC asynchronous call and PLC logic control of CNC system were put forward based on the principle of probe application in Siemens machining.