Background: In practicing qigong, People must achieve three Points : adjust their Posture, control their breathing and have a peace of mind. That is, Cho-Sin [調身] , Cho-Sik [調息] , Cho-Sim [調心] . Slow respiration is the important pattern of respiration to improve the human health. However, unsuitable breathing training have been occurred to mental disorder such as insomnia, anorexia etc. So, we think that the breathing training to consider the individual variations are desired. Objectives: We performed this study to examine the physiological effects of controlled respiration on the normal range of frequency domain electroencephalogram(EEC) in healthy subjects Also, to study examine individual variations according to the physiological effects between controlled respiration and Han-Yeol [寒熱] , respiration period, gender and age-related groups on the EEC in healthy subjects. Methods: When the subjects controlled the time of breathing (inspiration and expiration time) consciously, compared with natural respiration, and that their physiological phenomena are measured by EEC. In this research we used breathing time as in a qigong training (The Six-Word Excise) and observed physiological phenomena of the controlled natural respiration period with the ratio of seven to three(longer inspiration) and three to seven(longer expiration) . We determined, heat-cold score by Han-Yeol [寒熱] questionnaire, average of natural respiration period, according to decade, EEC of 140 healthy subjects (14 to 68 years old; 38 males, 102 females) by means of alpha, beta spectral relative power. Results: 1) In Controlled respiration compared with the natural respiration, ${alpha};I;(Fp2);and;{eta}$ I (Fpl, Fp2, F3, F4) decreased on the EEC. 2) In controlled respiration compared with the natural respiration, ${eta}$ I (Fpl, Fp2, F3, F4) increased with cold group, ${alpha}/{eta}$(F3) decreased with heat group, ${alpha}$ I (Fp2)increased with cold group in longer inspiration. But by means of compound effects, ${alpha}$ II(F3) increased with cold group in longer inspiration, the other side ${alpha}$ I (F3) decreased with heat group in controlled respiration on the EEC. 3) In controlled respiration compared with the natural respiration, ${alpha}$ I (Fp2) decreased with decreased-respiratory-rate(D.R.R.) group, ${eta}$ I (Fpl, Fp2, F3, F4) increased with D.R.R. and D.R.R. groups, ${alpha}/{eta}$(F3) decreased with D.R.R. group. But by means of compound effects, in controlled respiration compared with the natural respiration, ${alpha}/{eta}$(F3) decreased with D.R.R. group on the EEG. 4) In controlled respiration compared with the natural respiration, ${eta}$ I (Fpl, F3, F4) increased with female cup, ${eta}$ I (Fp2) increased with male and female groups, ${alpha}/{eta}$(F3) decreased with male group. But by means of compound effects, in controlled respiration compared with the natural respiration, ${alpha}$ I (Fp2) increased with female group on the EEC. 5) Compared with the natural respiration, in longer expiration ${alpha}$ I (Fp2) increased in their forties group, in longer inspiration ${alpha}$ I (Fp2) increased in their fifties group. But by means of compound effects, in controlled respiration compared with the natural respiration, ${eta}$ I (Fpl) decreased in teens group on the EEG.