A new kind of third-nonlinear optical Langmuir-Blodgett films is reported in this paper, And in which an interesting phenomenon, multiple forwavd optical phase conjugate wave (FPCW) outputs using BOXCABS degenerate four-wave-mixing, technique has been observed, This way to obtain multiple FPCWs is considered as a simple method to inverstigate the third-nonlinearities of thin films and some special applications in optical image processing are expected.