Objective: To understand the effect of different rates of stimulus on thermal threshold.Methods: TSA-2001 Thermal Sensory Analyzer was used.The cool

warm

cold pain and heat pain thresholds were determined at the two body sites in two group of age-matched health adults at different rates of stimulus by the method of "Limits".Results: There was no significant difference between the cool threshold and warm threshold at two sites.There was smaller cool pain threshold on left dorsum pedis and heat pain threshold on left fingers as the rate of stimulus was faster

while larger thresholds appeared as the temperature change was slower.There was significant difference between the above-mentioned two thresholds at different rates of stimulus.There was no significant difference between the thresholds of the cold pain on left fingers

the heat pain on left dorsum pedis.Conclusion: There is no significant difference between the warm

cool thresholds at the different rates of thermal stimulus by the method of "Limits" when the rate of thermal stimulus is low and the difference of two rates of thermal stimulus is smaller.The cool pain and heat pain threshold may degrade or not differentiate when the increase of the rate of stimulus is not enough.