1 was established by eleven breeders with yellow shell color selected from Liusha Bay stock of pearl oyster ）fifty mature individuals was also obtained by randomly selecting from the same stock as breeders. In October 2007 and CG groupscellulose and protease activities between the two groups were compared at 15 25 . The results were as follows The activity of amylase was the highestfollowed by cellulose and protease activities at different temperature. At the temperature range of 15the amylase activity of the two groups increased with the increasing temperature . The amylase activities of SG₁ and CG varied from 3.51 to 5.09and from 2.53 to 4.04 µg·min^{respectively. At 15 25 the amylase activity of SG₁ was higher than that of CG℃） In the experiment temperatures rangethe cellulose activity were positively correlated to the ambient temperature}·mg^{respectively. No significant difference was observed in the two groups ） At 15-30 the protease activity showed a positive correlation to the ambient temperature. The protease activities of SG₁ were much higher than that of CG at 15 （）the CG exhibited higher protease activities than SG₁ at 20and 30 . The results from the present study indicate evident differences in physiological indices between SG₁ and CGwhich will provide much more useful information for further breeding.}