Based on the consideration of the impact of current and local economic activities on the future and whole society, this paper takes factors such as time, space, opportunity and equity into analysis framework, and establishes a new equilibrium system-multidimensional equilibrium. Then, combining the theory of multidimensional equilibrium and revenue-cost analysis, a multidimensional equilibrium model is constructed. This model provides a tool for evaluating the social and economic activities more intuitive and scientific. Finally, in order to verify the effectiveness and universality of the multidimensional equilibrium theory and model, this paper selects three representative examples of economic activities from the macro level, the medium level and the micro level respectively, and applies the multidimensional equilibrium theory to evaluate the economic activities at different levels through the actual data. This study shows that, considering the future total revenue and total cost of economic activities from the dimension of time and space, with time goes on, most of the social total revenue of economic activities and the ratio of total cost increase after decreasing first. This tells that in the short-term future, the total revenue of some economic activities may be greater than the total cost, while in the long-term future, the total revenue is less than the total cost. Therefore, from the perspective of the long-term development, the development planning of a country should give more consideration to the multidimensional equilibrium, especially taking account of the future risks.