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Each operand in PLC logic instructions contain only an opcode. A new type of PLC logical instruction structure is designed, where its operation code can take multiple operands and its operands additional "auxiliary sign bit". It avoids in the process of execution logic instructions for multiple operands to decode several times. Researched on the data structure of this new instruction statement and the data structure of the ladder diagram, and using these two data structures to achieve the transformation algorithm of the ladder diagram into the new instruction list. Ladder diagram used in cascade order recursive scanning methods constructing binary tree structure, and postorder the tree traversal for an intermediate result instruction list, After the analysis of the logical relationship of intermediate result instruction list and combined process of operation for the same type of logical relations, the final instruction table is obtained. Through the series-parallel structure of ladder diagram transformation test, the new instruction statements transformation result is correct.