The tiny heat probe test system was used to determine the thermal conductivities of Muraenesox cinereus to solve the data scarcity of thermal parameters of aquatic products at different temperatures (from -30 to 20 ℃). It was convenient, easy to handle, required less time(<40 s), caused a little temperature rise(<2 ℃) of the tested sample and was suitable for measuring thermal conductivities of sample with true states. And then the thermal conductivities of Muraenesox cinereus were measured at 20 ℃、10 ℃、0 ℃、-10 ℃、-20 ℃ and -30 ℃ in detail. The results showed that the thermal conductivities of Muraenesox cinereus pre or behind phase transition can be obtained with the high precision by means of the tiny heat probe test system at different temperatures. Temperature had a significant influence on the thermal conductivities of Muraenesox cinereus. The thermal conductivities increased with temperature over the freezing point. The thermal conductivities rapidly increased below the freezing point and it increased with the temperature decreasing. And these studies may give some help to the engineering calculations and computer simulation in the course of freezing and thawing of Muraenesox cinereus.