Abstract: Based on the comprehensive analysis on the plastic parts structure service requirement, mounding quality and mould menu factoring cost. A corresponding injection mould of internal side core pulling was designed. By adopting the multi-direction and multi-combination core-pulling. A corresponding injection mould of internal side core pulling was designed, the working process of the mould was introduced学前儿童发展心理学 辅导2（第三、四章）第三章 学前儿童心理过程学习目标1掌握学前儿童的心理过程2能运用相关知识解释学前儿童在生活中出现的具
