The game is mainly for primary school grade three，corresponding the third grade third unit of primary school mathematics of Human education--measure. We have learned about the centimeter and meter, gram and kilogram.Now we are going to learn the other units of length mm decimetre and km, and the quality of unit tons.Game design from different angles.Interesting and consistent with cognitive law.Children can play while learning.Let the children fall in love with learning, truly happy learning.There are transcripts can be compared to！QD learn aims at teaching through lively activities and happy learning.