Research On Typical Mistakes And Attribution Of Junior Middle School Students’ Dynamic Geometry Questions

China is implementing its reform in foundation education, According to the New curriculum standards(2011), The content of traditional plane geometry has been cut out while the content of Dynamic geometry has been enriched, Which draws a wide concentration. Therefore, The Dynamic geometry plays an important ride in the junior high education. But it is a fact that students have trouble in learning it well in reality, Based on this fact, It’s well worth research the typical errors as well as analysis the reason why they make errors, Which has important and practical significance in promote teaching.This paper combines the test, questionnaire, interview and literature analysis and other research methods, and analysis some typical dynamic geometry problems in recent years examination. After this the author classify the dynamic geometry problems into 4 basic types:the point, the line, the graphics and the function. The paper adopts see appendix questionnaire and test as the investigation tools, takes 275 students as samples who come from two middle schools in Chongqing and a middle school in SiChuan. The paper concludes the errors they make frequently and tries to analysis the reason why they make such errors according to the test and questionnaire.The result shows that the Junior Middle School Students usually make the following 6 types errors:(1)Students can’t fully understand the question. The reasons may:they don’t read the question carefully; they fail to take everything into consideration; they feel confused about the question, and so on.(2)Students don’t know the range of the movement of the dots, the lines, the graphics, and the way the more clearly.(3)Students get confused about the caw of movements.(4) Students fail to take every classifications into consideration, because they lack the back information about the problem.(5)Students find it difficult to get the fixed invariant and equal relations.(6)Students can’t avoid making mistakes during their calculation.According to the test and questionnaire, Students make following errorsFrequently:firstly, they don’t understand the basic notions of dynamic geometry clearly, Which causes they get confused about the question easily. Then, Their poor skills of calculation makes it a challenge for them to find the rules in dynamic geometry and involve all kinds of possibilities. Thirdly, Students can’t analysis dynamic geometry problems with the help of graphics. What’s more, They lack the ability of self-control.