Psychological experiments we know that the poor stability of high school students attention, in normal circumstances, 10-to 12-year-old children can continuously focus on about 25 minutes for children over the age of 12 in about 30 minutes.

Experiments by psychologists, we know that poor students attention, stability in the general case, 10 - 12-year-old child can be continuously focus on about 25 minutes, and more than 12 years old children in about 30 minutes.

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By psychology experiments we know, poor stability of middle school students ' attention, in general case, 10-12-year-olds can continuously focus on 25 minutes, children over the age of 12 in about 30 minutes.

Tests us through the psychology to know that, the middle-school student attention stability is bad, in the ordinary circumstances, 10-12 year old child may strongly pay attention to about continuously 25 minutes, above 12 years old child about 30 minutes.