The stress change was tested of Luschka joints under axial load after partial cervical discectomy in fresh male cadavers with 12 functional spinal units. We putted the pressure sensitive film of excessive low-pressure into Luschka joints to test the change under the axial load of 39.2N,49N and 58.8N orderly. The data wae calculated by EPD 301 concentration meter and EPD-302.pressure-scale lneter.The results showed that cervical discs beared the load of axial pressure physically,but Luschka joints did it little;Compressive stress in Luschka joints increased statistically because of narrow intervertabra causing new stress distributuion after panial discectomy(P<0.01).The result suggest physical function of the discs be important, It is an important subject how to reconstruct discs function, matain cervical intervertebra height and cervical spinal stability.