BC ASSR is hardly used, but it is appropriately used infants and children who have disorder with external or internal ear made the use of each wave of BC ASSR. So this study have showed not only frequency modulation of 80 Hz but also frequency modulation of 40 Hz which is not researched occasionally. Moreover, I have studied groups which are suffer from hearing, divided them used measurement between the sensory neural hearing loss and the conductive hearing loss, evaluated AC ASSR and BC ASSR and compared the number of PTA. Methods：The subjects consisted of normal adults (using 10 right ears), sensory-neural hearing loss (SNHL using 10 right ears), conductive hearing loss (joined 6 right ears). PTA is GSI (Grason- stacller Inc.) 61 Audiometer, and ASSRs is AUDERA system using mixed modulation which is consists of frequency modulation. Results：Results were as follows. First, a comparison with AC ASSR and AC PTA, measuring AC ASSR-AC PTA in 80 Hz is smaller number than in 40 Hz. Furthermore, the number of AC ASSR-AC PTA has high numerical value in normal group, the sensory neural hearing impaired is the second, the conductive hearing loss is the third. Secondly, Comparing BC ASSR-BC PTA, BC ASSR-BC PTA in 80 Hz is smaller than BC ASSR-BC PTA in 40 Hz, when measuring numeral value. The numeral value is much more smaller as the condition differs. Finally, The average of ASSR ABG-PTA ABG is much more smaller than the 40 Hz and 80 Hz. It couldn’t be matter of distinction. Conclusions：We should standardize ASSRs and PTA. and discover lots of evidence which support those experiments. Infants and Children have to be taken airway examination to check their external ear-disorder and internal eardisorder, as well. It is rare cases that we take a density of marrow examination in each frequency to support various studies. KEY WORDS：ASSR·Hearing thresholdz·Modulation frequency.