Abstract: The structure for broad-band integrated optical waveguide amplifier with thin-film filter is designed, and three structure, single path, round path and multi-path, are given, the advantage and shortcoming of different structures is compared, the advantage of single path structure is simple, shortcoming of which is lower total gain, whereas round path structure has higher gain, and fabrication of which is complex, multi-path structure is obtained with combination of the advantage of above two structures. It is shown that multi-path broad-band integrated optical amplifier structure is the best.