Nowadays

there is a great development in sequential estimation technology

which is the main field of sequential acquisition.But the sequential estimation algorithms lack of an effective and compatible analyzing model to meet this development.The paper presents a 2-dimensional accumulating space analyzing model

and the analyzing model gives the corresponding relationship of the amplitude accumulating space and the probability accumulating space.Based on the analysis results of the model

we could design some other sequential estimation algorithm with better performance.The simulation results show that they accord with the theory analysis results and the analyzing model can be used to analyze much of the existing sequential estimation algorithms.