In our paper for the kind of question of the zero value of the expected input signal of controlling object,utilized the relation between feedback transfer function and the input signal,proposed a new controlling strategy,and analysed the relation between which and the tradition PID controller.

The shape and character of the zero line,an important criterion for magnetic memory testing of the normal field is analyzed under different longitudinal magnetization.

In this paper, through working on C/O ratio to get rid of zero drift, and limit the C/O radio to the generalized performance range, and use universal interpretation model to deal with data of C/O ratio.