并就简化模具结构设计的优缺点与前后三次激光选区烧结（SLS）的成型工艺条件和收缩率进行了探讨，提出了SLS技术的现状、发展趋势与方向。

The advantages and disadvantages of simplifying the mould structure, and the molding condition and contraction rate of the successive SLS three times are discussed.

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本文在介绍快速成型技术的一个重要分支——选区激光烧结的基础上，提出了一种基于小功率激光快速成型系统的金属零件成型工艺。

Introducing selective laser sintering (SLS), an important branch of RPM, this paper gives a new method oriented on low power SLS system to fabricate metal parts.

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