The research results of the long wave 1024×256 infrared focal plane detector assembly for hyperspectral applications are introduced.The long wave infrared detector chip is based on liquid epitaxial HgCdTe film material,the readout circuit is designed based on 0.35 CMOS 5.0V process,and the detector package structure is unsealed type and integrated with hyperspectral camera.The test results show that the long wave 1024×256 infrared focal plane detector assembly has normal functions and excellent performance.