Abstract: Dosimetry verification is an important ring in quality assurance for intensity-modulated radiation therapy (IMRT) and is an indispensable procedure in clinlic, with the development of radiation physics technique, new devices and new methods have been applied constantly. They provide us to do the better and more convenience in quality assurance for IMRT, two dimensional ionization chamber array (MatriXX) is a quick dose measurement system, and one of the most advanced two dimensional dose verificatiou system in IMRT at present. It may measure dose distribution and intensity distribution in field size. It may reduce workload and raise efficiency of dosimetry verification in IMRT.