新课程背景下的科学课堂是开放的,课堂有效教学的前提是备好课,教学情境的创设有利于活跃课堂气氛、提高课堂效果。课后作业的设计和评价,可以对有效教学进行及时的反馈。本文结合课堂教学实际,从课前预设、课堂教学情景设计和课后教学延伸三方面,分析了如何促进科学课的有效教学。 The science classroom in the context of the new curriculum is open. The premise of effective classroom teaching is the preparation of lessons. The creation of teaching situations facilitates the active classroom atmosphere and the improvement of classroom effects. The design and evaluation of homework assignments can provide timely feedback on effective teaching. This article analyzes how to promote the effective teaching of science class from three aspects: pre-school presupposition, classroom teaching scenario design and post-class teaching extension.