The invention relates to a method for quantitatively controlling the 
operational stability of a 
servo mechanism by using an automatic 
gear grinding technology. The method can be implemented through adopting an automatic running-in and 
stability test system. The method includes the steps of 
movement control, data collection and analysis, and running-in parameter and evaluation criterion establishment. According to the 
movement control, the 
servo mechanism moves in a reciprocating manner in an operation position range under control according to movement parameters and operation positions, and automatic gear running-in is performed on the transmission chain of the 
servo mechanism. According to the data collection and analysis, in an automatic gear running-in process, work 
state parameter data are acquired, and are processed, and 
processing results are display in real time. According to the running-in parameter and evaluation criterion establishment, 
operational stability quantitative detection is performed on the servo mechanism, and the running-in process parameters of the transmission chain of the servo mechanism are determined, and quantitative evaluation criteria of qualified running-in are established. With the method of the invention adopted, automatic running-in of the transmission chain of the servo mechanism can be completed with shortest time and minimum manpower and 
material resources, and the stability detection of the servo mechanism can be realized with quantitative evaluation indexes, and malfunctioned products can be reduced, and the rate of 
rework in processes can be reduced, and 
batch production efficiency and product reliability can be improved.