The research system, main methods, important findings and core conclusions of this paper should be briefly summarized. Before writing an abstract, we must make clear the elements and basic requirements of the abstract. 1. abstract elements: (1) research purpose: describe the research purpose accurately, and show the research scope and importance. (2) Research methods: Briefly explain how the basic design and conclusions of the research topic were drawn. (3) Results: Briefly describe the main results of this study, what are the new findings, and explain their values and limitations. The narrative should be specific and accurate. Second, the writing requirements of the abstract: (1) The abstract should be independent and self-explanatory, and should have the same main information as the document, that is, you can get the necessary information without reading the full text of the document. Therefore, the abstract is a complete essay that can be quoted. (2) Use the third person. As an independent style that can be read and retrieved, it can only be written in the third person, not in other people. In some abstracts, "we" and "author" appear as the themes of abstract statements. Generally speaking, this will weaken the objectivity of abstract statements, and sometimes it will be illogical. (3) Exclude the contents that have become common sense or popular science knowledge in this discipline. (4) Don't simply repeat the information already stated in the title of the paper. (5) To objectively and truly reflect the content of the original text, it is necessary to focus on the new content of the paper and the viewpoints that the author particularly emphasizes. (6) Strict structure, exact semantics, concise expression and generally no paragraphs are required; Never make empty comments or draw ambiguous conclusions. (7) Standardized terminology should be adopted. (8) Don't use charts, tables or chemical structures, and abbreviations, abbreviations and codes that are difficult for neighboring professional readers to clearly understand. (9) The chapter number, drawing number, table number, formula number and reference contribution number listed in the literature shall not be used. (10) requires the use of legal units of measurement, and the specification is written correctly with words and punctuation. (1 1) It is required to use countries, institutions and special terms with abbreviations or abbreviations as much as possible. The length of (12) should be between the lower limit and the upper limit required by the magazine. For example, the following is an abstract of a paper published in the American Journal of Optics. Please read and understand according to the previous elements and writing requirements. Generalized Huygens-Fresnel diffraction integral of misaligned asymmetric first-order optical system and eccentric anisotropic Gaussian Schell model beam: the revised draft was received on July 2006 19 and May 2006 1 day; The generalized Huygens-Fresnel diffraction integral of misaligned asymmetric first-order optical system is derived by using regular operator method, which enables us to study the propagation characteristics of anisotropic Gaussian Schell model (AGSM) beams through misaligned asymmetric first-order optical system. The results show that the AGSM beam does not remain closed under the action of the misaligned asymmetric first-order optical system. Therefore, the generalized partially coherent anisotropic Gaussian Schell model beam is introduced, which is called eccentric isotropic Gaussian Schell model beam. AGSM beam can be regarded as a special case of eccentric isotropic Gaussian Schell model beam. ? 2002 AOA code: 260.1960,050.1940,350.5500. On the day of receiving the revised draft, the paper was accepted. It can be seen that the reviewers' opinions were published after revision, so it can be judged that the revised content of the paper is not important. It shows that the first draft of the paper basically meets the requirements of the magazine.