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1·Back light in the Yougang Grottoes, appeared together with Buddhist statues, had direct relations with art origin of the Yungang Grottoes.

云冈石窟背光，与佛教造像同期出现，与云冈的艺术源流有直接关系。

2·Four corners pattern existed in the middle period of Northern Wei Dynasty at Yungang grottoes courtyard also reflect the connection with the Hexi Corridor.

云冈北魏中期石窟天井所见四角叠涩图形、西域式飞天，又反映了与敦煌的联系。

3·Carbonate cement is universally more than 10% in sandstones of the upper Yungang formation in Yungang Grottoes area. It's mainly composed of ferriferous calcite and ferriferous dolomite.

云冈石窟地区云冈组上段砂岩中碳酸盐胶结物的含量普遍在10%以上，其主要矿物成分为含铁方解石和含铁白云石。

4·To know the current status of airborne pollution in Yungang Grottoes, main substantial composition of the deposition of airborne particles is analyzed by means of XRD, SEM (EDAX), and microscope.

为了解云冈石窟大气中粉尘污染的现状，用X射线衍射、扫描电镜(EDAX)和显微镜对大气中粉尘的主要物质成分进行了分析。