In the spillover effect aspect, export in the primary industry, and import in the second and the third industries promote these industries 'increase by active spillover effect to non-import sector; 从外部溢出效应看,出口部门在第一产业有正向的外部效应,进口部门主要通过对第二、三产业的非进口部门产生积极的正向的外部溢出效应来促进其增长;