It has been argued in the previous studies whether temporal properties of chromatic response are different among the chromatic mechanisms. In this investigation, we measured temporal integration properties of chromatic responses with the isoluminant chromatic double-pulse method. Red, green, blue and yellow chromatic changes from aw hite were used as test stimuli. Their dominant wavelengths were 630, 502,469 and 576 nm, respectively. Duration of stimuli were set at 10 ms for red, green and blue pulses and 40 or 50 ms for the yellow pulse. SOA (Stimulus Onset Asynchrony) were chosen from 10 to 2000 ms. The retinal illuminance of all stimuli was 10 Td. The threshold for detecting chromatic change was determined as af unction of SOA by the constant stimuli method. It is shown that the temporal integration characteri,tics of double pulse were not so different among red, green, blue hues. We could not obtain reliable results for yellow hue, probably because of a temporal artifact of our apparatus. We also calculated impulse response functions for red, green and blue hues by using a model based on n-stage low-pass filter and probability summation.