Rice hull was used as an additive in order to determine the its effect on increse of mushroom growth and yield in Chungnam Provincial techinical institution. In the treatment of 80% rice hull in small Neutaribeosut, mycelial growth duration was shown to be shorter about 11 days and yield increased about 7oie than those of conventional culture. In the case of Chongpung Neutaribeosut bottle culture, mycelial growth duration was shorter about 2 to 3 days in additive of 30 to 80% rice hull compared to conventional, but yield was similar to that of conventional. In the treatment of 30% rice hull in Agrocybe aegerita bottle culture, mycelial growth and yield increased 6 days and 6% than those of convrntional, respectively. In the treatment of 30% to 40% rice hull in Ganoderma lucidum bottle culture, mycelial grow durations were similar 45 days and 38 g/bottle.