Imaging spectrometer combines two dimensional imaging technology and spectrometer technology

and it is a promising instrtument for earth observation. With the development of technology of pushbroom imaging with focal plain detectors

hyperspectral imager was developed as an advanced remote sensing instrtument in recent years and it becomes another grow point of imaging spectrometer technology. As increase of the demand of environment study and city planning

Pushbroom Hyperspectral Imager （PHI） was built under the cooperation of Shanghai Institute of Technical Physics

Chinese Academy of Sciences

and Shanghai Senstron Institute of Information Technology. PHI uses Si CCD as focal plain detector. It has a field-of-view of 21 degrees with spatial resolution of 1.5 mrad

and 244 spectral bands covering from 0.40 to 0.85 micrometer in wavelength with spectral resolution better than 5nm in full range. This paper discuses the key technology of PHI

including critical components

system calibration

ground reflectance and radiation calculation and multi-system integration. The image taken by PHI in remote sensing operation for city planning of Beihai

Guangxi province

is also given.