The data proved my hypothesis is fault and the right answer is females have an better ability of estimating things. We do three experiments, and we use the data from these three experiments to make three charts, analyze these three charts and following table, we got the result, all three charts proved that Females can estimating size more accuracy, because the average of the females in these four charts have been estimated is closer to the actual size. But when research about this topic, I got confusion, because some researches said that males are better estimators and other researches said that females are better, but one research is very interesting, is said the males always think the objects are bigger, and my experiments also proved that point. I think there are two factor can influenced the experiments’ results, the first one is Psychological effects, the first who told the data may influenced the next person and other classmates would also told the data, this can also influence the mentality of males and females. This factor could make a big influence of result. The second factor is that the distance between men and objects are different, and males distance always bigger than females, for the height of males is taller than females, the table is shorter than both males and females, and females are shorter than males so the distance between males and objects must longer than the distance between females and objects. Though this factor’s influence is small, the difference distance between males and females is about 5cm, but it can also influence the experiment’s result.