Abstract:By taking jun-jujube in south Xinjiang as the research object， the quality of the jun-jujube was de－ tected by the parameter variations of its dielectric properties. The parameter variation of jujube samples dielec－ tric properties was analyzed at different temperatures （55， 60， 65 ℃） when radio frequency was 10 kHz and surface pressure value was about 0.01 N， and five dielectric properties parameters that included inductance LQ，capacitance CD， resistance RQ， complex impedance ZQ and complex impedance ZD were introduced as evaluation index of detecting jujube quality. By analyzing the change relation between dielectric properties parameters and drying temperature， drying time of jujube， the paper proved that the effect of drying temperature and drying time on its quality ，and obtained the optimal drying technology parameters that were suitable for on-line rapid detection of the jujube quality were as follows： drying temperature was 60 ℃， complex impedance was ZQ. Fur－ thermore， the effect of jujube initial weight on complex impedance ZQ was explored when the drying temperature was 60 ℃， and the conclusion was that the bigger initial weight was， the more stable the complex impedance ZQ was. This research would provide theoretical basis for the development of nondestructive testing technology on jujube industry and reference value for the industrial development.