Cognition and intelligence education for five-tosix-year-old children prepared to enter grade 1st is crucial and indispensible as this period lays the foundations for children's later intelligence acts. Of the factors helping to form children's intelligence acts, stability is a key factor giving rise to children's intelligence acts. This research aims to study five-to-sixyear-old children' stability to determine numbers through observing and testing children's actions. In this ways, the authors will be able to determine the levels. tendency and role of actions in the process of intelligence acts' occurrence. It is hoped that the findings of the research will help educators understand more thoroughly the process in general, children' stability to determine numbers as well. which provides good preparation for children before entering grade 1st.