Abstract: To solve disassembly sequence optimization problems, a multi-objective mathematical model was established with optimization objectives of minimizing the disassembly time and maximizing the disassembly profit. The linear weighted method was used to transform the multi-objective model into single objective one, and an improved scatter search algorithm was presented. In the algorithm, the PPX procedure was used as a subset combination operator, and the local search disassembly sequencing operator was used to improve new solutions generated by the combination operator. The effectiveness of proposed model and algorithm for multi-objective disassembly sequence optimization problems are validated by the testing results.