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现有学习软件或虚拟教具存在交互方式不自然、抽象性差、不智能的缺点，应用基于自然的人机交互技术，以物理教学中的平抛运动教具作为实例，设计实现一种3D虚拟教具用以模拟教学过程中的真实教具。这种虚拟教具主要采用手势识别技术实现人和计算机的自然她交互，同时采用虚拟现实技术构建微具实体。应用人机自然交互技术支持的3D虚拟教具，具有交互方式自然、空间感强和抽象表现力强的特点，体现了和谐自然地人机交互方式在教育中的广泛应用前景。“,”The current learning software or virtual manipulatives have the shortcomings of unnatural interaction, poor abstractness and unintelligent in application. Using natural human computer interaction technology and taking the horizontal projectile motion in physics instruction as an example, a kind of 3D virtual manipulatives was designed which had the ability to simulate the real teaching aids. Gesture recognition technology was used to realize the natural human-computer interaction. The well designed 3D virtual manipulatives has the characteristic of natural interaction, great abstractness and spatial impression which reflects the board application prospects of natural human computer interaction in education.