Abstract: ‍ ‍To solve the problem of blind recognition of TPC codes， the structure and subcodes of TPC codes are studied， and a method for blind recognition of TPC codes under error code conditions is presented by using the redistribution of subcodes. And lists the typical subcode types and parameters of TPC codes. The differences of minimum Hamming distance and code rate between different types of BCH codes as subcodes are analyzed. The relationship between code length and parity of code weight is studied， and the property that the weight of subcodes is even is obtained. Using the structure of two-dimensional TPC codes and the properties of linear system block codes， it is deduced that the parity part of three-dimensional TPC codes has the same property. Based on the above properties， traverse different code lengths to calculate corresponding even-digit weight ratios， and use the relationship between code length and code-word weight parity to realize the recognition of subcode extended BCH code and even-check code length， which can be applied to two-dimensional and three-dimensional TPC codes. The simulation results show that the derived proposition is consistent with the simulation results， and the proposed method can realize the effective blind recognition of TPC codes under the condition of high bit error rate.