Abstract: Two heat transfer parameters in the fixed bed,radial effective conductiviw k_(er),and wall heat transfer coefficient h_ware estimated by using the method of orthogonal collocation and non-linear least square.The temperatures at forty collo-cation points distributed along the radial direction are measured simultaneously by means of multiehannel data logger.Theeffects of bed height,Re_p,d_t/d_p,gas inlet temperature and wall temperature on k_(er)and h_w are studied.The results indicatethat the effect of gas inlet temperature and wall temperature is negligible.Bed height will only influence the parameter es-timations in shallow bed and at low Re_p.Both k_(er)and h_w tend to reach a limit with increasing bed height.The asymptoticbed height which is independent of d_p is about 0.5 m,while the asymptotic values of k_(er)and h_w increase with d_p.The pa-rameters obtained with the wall being heated are about 10% lower than those with the wall being cooled.k_(er),h_w and stag-nant contribution terms k_(er)and h_w are all related to dp·k_(er)and h_w estimated at the asymptotic bed height are correlated bythe following equations:k_(er)=0.199+0.015 d_t/d_p+0.0020/(1+14.15(d_p/d_t)~2)Re_ph_w=33.4+4.23d_t/d_p+0.333/(1+8.54(d_p/d_t)~2)Re_p(5.5