讨论了技术科学与工程科学之间的关系，认为技术科学就是应用科学，其内容属于应用基础研究的范围，而工程科学则是综合运用技术手段和管理手段解决工程问题的学科，其内容属于应用研究范围；提出了建立自然工程学的建议，并对已有和尚不存在的自然工程学科进行了分类，并讨论了系统科学与工程科学之间的关系。

Based on the recognition of difference between science, technology and engineering, this paper discusses the relationship between applied sciences and engineering sciences. The applied .sciences deal with knowledge having value of practical usage which laid the foundations to develop useful technologies. The engineering sciences contain comprehensive knowledge both about technology and management. The paper also gives a suggestion of establishing a comprehensive engineering science named as the natural engineering science and discusses the relationship between the systematic science and engineering science.