In Oyama Dam foundation treatment, the rim curtain grouting for right bank was grouted by automatic grouting control system on mix proportion, which greatly contributed to shortening the construction period. In addition, the right abutment curtain grouting was also performed by this system in the high altitude part where autobrecciated andesite was dominant, and the grouting effect of the ultrafine cement by the automatic grouting control system on mix proportion was successfully confirmed. This paper reports the grouting effect of the ultrafine cement by the automatic grouting control system on mix proportion.