TOUYINGDEFENLEI：

GENJUTOUSHEZHONGXINYUTOUYINGMIANJULIBUTONG，TOUYINGKEFENWEIZHONGXINTOUYINGHEPINGXINGTOUYING。

1、ZHONGXINTOUYING

DANGTOUSHEZHONGXINSZAIWUTIHETOUSHEMIANYOUXIANDEJULINEISHI，FASHECHUFANGSHEZHUANGDETOUSHEXIAN，YOUZHEIXIETOUSHEXIANZUOCHUDETOUYING，CHENGWEIZHONGXINTOUYING。

2、PINGXINGTOUYING

DANGTOUSHEZHONGXINSJULIWUTIHETOUYINGMIANWUXIANYUAN，TOUSHEXIANJIANGGENJUYIDINGDETOUSHEFANGXIANGPINGXINGDITOUSHE，YONGPINGXINGTOUSHEXIANZUOCHUDETOUYINGCHENGWEIPINGXINGTOUYING。

平行投影又可分为正投影和斜投影。当投射线垂直于投影面时，称为正投影；当投射线倾斜于投影面时，称为斜投影。

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