This research focused firstly on; constructing and improv,ing the proper equipment for measuring the specific heat (C)' thermal conductivity p (k) and thermal diffusivity (0.) of giant tiger prawn. banana prawn. squid and cuttle fish and secondly. studying the effects of breeds (Penaeus monodon Febricius, Penaeus mergmensis de Man), freezing methods lair-blast freezing and dry-ice freezing) and temperatures (-30+ 1 -18+ 1 and -10+ 1 ℃) for giant tiger prawn and banana prawn; and studying the effects of breeds IL.otigo formosana and Sepia pharaonis), conditions of thawing (unthawed and thawed) and temperatures (-40+1 -30 + 1 -18+ 1 and -10+ 1℃) for squid and cuttle fish on their thermal properties. The Cp' k and 0. were measured by modified method of mixture. thermal conductivity probe.and thermal diffusivity plate, respectively. The corresponding Cp' k and of giant tiger prawn frozen by air-blast freezing were 0.423 -1.148 cal/g℃. 1.109 -1.288 W /m K, and 5.116 x 710 -6.942 x -710 m /s while the giant tiger prawn frozen by dry-ice freezing were 0.433 -1.147 cal/g℃, 1.066-1.291 W/m K, and 5.837 x -710 -7.851 x -710 m2/s respectively. The values of Cp' k and 0. of banana prawn frozen by airblast freezing were 0.516 -1.206 cal/g℃, 1.116 -1.304 W /m K. and 5.908 x -710 -7.141 x -710 m2/s and t~ose of banana prawn frozen by dry-ice freezing were 0.509 -1.198 cal/g℃, 1.122 -1.313 W/m K, and 5.942 x -710 -7.800 x -710 m I 2/s, respectively. The values of Cp' k and 0. of unthawed squid were 0.481 " I 1.143cal/g℃, 1.311-1.567W/mK,and2.761 x-71O-7.451 x-71O m2/swhile those of the thawed squid wrer 0.375 -1.017 cal/g℃, 1.156 -1.349 W/m K. and 2.833x 710 -8.814 x -71 q m2/s. The value of Cpo k and 0. of unthawed cuttle fish were 0.435 -1.111 cal/g℃, 1.279 -1.523 W /m K, and 2.891 x -710 -8.492 x I -710 m2/s and those of thawed cuttle fish were 0.426 -1.066 cal/gOC. 1.2441.493 W/m K. and 2.901 x -710 -8.554 x -710 m2/s. respectively. The k and 0. were found to be polynomial functions with breeds, freezing methods and temperatures. while the Cp was found to be polynomial functions with breeds and temperature for giant tiger prawn and banana prawn. For squid and cuttle fish, the C, K and 0. were found to be polynomial functions with breeds, pconditions of thawing and temperatures.