Abstract: The industrialization process of artificial intelligence technology is reshaping the global economic pattern, and the changes in employment structure, income distribution adjustment and industrial transformation and upgrading caused by it have become challenges for policy-making in various countries. How to find a balance between technological dividends and social equity has become a practical problem to be solved. By constructing a multi sector dynamic stochastic general equilibrium model (DSGE) including AI and its capital tax, this study found that the deepening and popularization of AI reduced the employment scale and wage level and reduced the share of labor income through the employment substitution effect; It further leads to the loss of social welfare by expanding the income gap between groups. For the "double-edged sword"effect of artificial intelligence, a single tax policy or monetary policy can not achieve the goal of promoting the development of new productivity and narrowing the income gap at the same time, so we should use the "combination fist"of policy to hedge the "side effects"of policy. The essence of AI policy optimization is to rebalance efficiency and fairness, innovation and stability, technical rationality and social value. This study found that moderate AI capital tax can inhibit income polarization, alleviate the decline of labor income share by weakening the effect of economic stimulus and inhibiting the effect of employment crowding out, and improve social welfare by reducing the income gap between groups through income redistribution. This paper proposes that the total output will increase and the income gap will narrow with the implementation of tight tax policy for artificial intelligence, loose tax policy for physical capital and loose monetary policy. At the same time, it is necessary to further strengthen the long-term and short-term coordination and cross cycle coordination of tax and monetary policy, improve the skill training system of the labor market, and help achieve the goal of diversified economy of artificial intelligence development and narrowing the income gap.

Key words: artificial intelligence tax, monetary policy, new productivity development, narrow the income gap