一堂好的公开课有着不可低估的作用。但目前有一部分公开课由于执教者急功近利而变了味，主要表现如下：准备过度，脱离实际。为了上好一节公开课，执教者往往花费大量时间准备，甚至连正常的教学都顾不上。不少公开课，由一人执教，集体备课，多次修改教案和试教，执教者失去 A good open class can not be underestimated. However, there are currently some open classes that have become tainted by the coaches’ eagerness for quick success. The main performances are as follows: Over preparation, out of reality. In order to get a good lesson out of class, coaches often spend a lot of time preparing and even normal teaching. In many open classes, one person teaches, prepares lessons collectively, and changes teaching plans and trials several times. Coach loses