<正> Twenty-eight adult macaques were divided into five groups for differenttreatments.Of these five groups

groups 1 to 3 were exposed to heat once dailyfor 10d until the rectal temperature （RT） rose to 40℃

40.8℃ and 41.6℃

respectively.The other two groups （groups 4 and 5） were exposed to heat twicedaily and every other day

respectively

until the RT of both groups reached41.6℃.The method of heat exposure to obtain the required RT was to keep themacaques in a hot chamber （Td 41℃

Tw 38℃）.Before and after theacclimatization period

the macaques were given a standard high temperature testin the same environment as the heat acclimatization （HA） period until the RTrose to 41.6℃.The results revealed that the animals in groups 3 to 5 whose RTin HA increased to 41.6℃ showed a significant HA effect by prolonging the dura-tion of exposure （P<0.05～0.001） and decreasing the RT （1.14～1.83℃）

especiallyin the daily exposed group.Therefore

one of the most effective ways for devel-oping full acclimatization in macaques is to expose to heat once daily for 10duntil the RT rises to 41.6℃.