本文自主创建了初中物理教材比较分析模型,并对中国和美国教材中的压强和浮力部分就难度问题进行静态的文本分析,包括广度和深度两个维度.研究结论为:中国教材的广度低于美国教材.难度低于美国教材,但知识点的平均深度高于美国教材,中国教材应降低单个知识点的深度,并且加大和实际生活的联系,提高学生的学习兴趣.该模型不仅可以进行定量分析,也可进行定性分析,可以很好地应用于国际教材的比较研究. This paper creates a comparative analysis model of junior middle school physics textbooks independently, and makes static textual analysis on the difficulty of the pressure and buoyancy parts in the textbooks of China and the United States, including breadth and depth dimensions.The conclusion is that the breadth of Chinese textbooks is less than However, the average depth of knowledge points is higher than that of the American textbooks, and the Chinese textbooks should reduce the depth of individual knowledge points and increase their contact with the real life, so as to increase students’ interest in learning.This model can not only quantify Analysis, but also for qualitative analysis, can be well applied to the comparative study of international teaching materials.