A recently developed method for 24-hour continuous measurement of indoor-environment characteristics was applied to investigate care centers for aged people. The purpose was to establish the methodology to assess indoor-environment characteristics at arrangement of negative influence. The method allowed to monitor carbon monoxide concentration, carbon dioxide concentration, airborne dust concentration, air velocity, air temperature, relative humidity, noise level and illuminance. The measured magnitude of those factors mentioned above are categorized into several grades respectively, according to the comparison with recommend (health related) values. Close congruence with the field-measured results shows the validity of questionnaire. The results show that"Noise Level" and "Relative Humidity" are represented as two significant negative-influencing factors in care centers for aged people in Taiwan.