The study taking number、number operation and pattern as the starting point, use individual interviews to investigate 120 children aged 4-6 in Shanghai in order to investigate the developmental characteristics and trends of multi-representations in 4-6 year-old children’s mathematics cognition. The major findings of this study were as follows: The children aged 4 to 6 years have developed initial multi-representation ability in number, number operation and pattern in the development of mathematics cognitive. The children between 4 to 6 years have age difference in the number of the representation forms they used in the multi-representation tasks in number.The children between 4 to 6 years have significant age in the development of multi-representation in number operation. With the age, the number of the representation forms children used also increase. With the age, 4-6 year-old children’s multi-representation levels increase. Significant positive correlation emerged between their multi-representation levels in number operation and the number of the representation forms they used.No significant age or gender differences were found between the development of 4-6 year-old children’s multi-representation in pattern. But the children between 4 to 6 years have age difference in the number of the representation forms they used in the multi-representation tasks in pattern. With the age, the numbers of the representation forms children used increase. Children aged from 4 to 6 tend to use the real-world situations and manipulative aids which both were descriptive representations.Significant positive correlation emerged between the 4-6 year-old children’s multi-representation abilities in number and in number operation. Children’s multi-representation abilities in number operation and in pattern also have a certain correlation.