The translation of scientific and technological literature is a medium and method of acquirement of world advanced science and technololgy information, and plays a positive role in encouraging the development of scientific and technological cause, Currently, nobody has put forward the standard of scientific and technological translation which can be widely approved. Basing on the long-term practice in scientific and technological translation, the authors advocate that Fulei' s doctrine of" Meaning Aptness Rather Than Form Identity" is taken as the theoretical instruction of scientific and technological translation, and discuss how to run this doctrine through the whole process of scientific and technological translation. This paper makes a trial analysis of three-steps process in the translation of scientific and technological literature, and the authors hope that this paper would be helpful to the translating work done by the scientific and technological workers to accurately and timely acquire the information on science and technology.