The reasons leading to them were given and the solutions were put forward.Through reducing the pouring velocity, the air gas entrapments and partial shrinkages can be elimiated effectively.

• 发现通过降低浇注速度，可有效地消除在浇铸过程中所产生的气孔和部分缩孔缺陷，以获得高质量的镁合金铸件。