On one side of the inner altar stood the Sanching altar, which enshrined the Sanching Taotsu (the three highest Daoist deities). In front of it was another altar where the chingcheng jiao ceremony was performed and where people and the gods communicated.
內壇兩方，一邊是供奉三清道祖的三清壇，壇前設有一座「洞案」，是慶成醮所有儀式進行的中心點，也是人神相通之地。