关键词: 双循环重心, 贸易自由化, 生产率增进, 资源重新配置效率

Abstract: To build a new pattern of dualcycle development and promote highquality development is a strategic decision made by the central government on the 14th FiveYear Plan and the longterm development goal of 2035The dualcycle has a cyclic focus change problem，and one of the important elements of highquality development is productivity improvementThis paper embeds the change of the dualcycle focus into heterogeneous firm trade model to reveals the impact of the shift of the dualcycle focus from international to domestic on the productivity improvement of trade liberalization from the perspective of resource reallocation efficiencyFinally，it uses the data of Chinese manufacturing enterprises from 1998 to 2013 to conduct empirical test and mechanism analysisIt is found that trade liberalization with international circulation as the main body leads to intensive resource misallocation and extensive resource misallocation，and restrains the aggregate productivity growth of the industry，while trade liberalization with domestic circulation as the main body helps to improve the efficiency of intraindustry resource reallocation and promote the aggregate productivity growth of the industryTherefore，changing the economic development model which is excessively dependent on international circulation and to construct a new development pattern in which domestic circulation is the main body and domestic and international double cycles promote each other is the key to enhance productivity gains from trade liberalization and promote highquality development of foreign trade.

Key words: dual-cycle focus, trade liberalization, productivity improvement, resource reallocation efficiency