Abstract: This paper discusses the conception and the mechanism of synergistic development of “Five Modernizations”， establishes the synergistic index system of “Five Modernizations” for Liaoning Province， and calculates the synergistic development index via entropy method and the coupling degree and synergy of synergistic development via coupling function. The result shows that the overall development index of “Five modernizations” is growing. The informatization development index is the highest whereas the industrialization development index is the lowest. The coupling degree of “Five Modernizations” is in the medium high coupling level area， and the relationship between them is very strong. The synergistic degree of “Five Modernizations” shows a slow growth trend， with rapid development in the early stage and slow development in the later stage. Therefore， Liaoning Province should take informatization as the guide to drive the development of new industrialization and modern agriculture， promote the construction of new intelligent urbanization with the goal of informatization and greenization， and realize the overall revitalization of Liaoning Province.

Key words: synergistic development of five modernizations, new pattern of industrialization, informatization, greenization, coupling degree