This work aimed to introduce a design method of creep testing system for cushion materials, including the hardware design of the testing device and the development of corresponding software. A new creep properties testing device for cushion materials was designed, and the test system software was developed with LabVIEW software. The sound card of PC was used as data acquisition card, with the hardware of the sensor and V/F converter used to collect and analyze the thickness variations of cushion material under a certain static pressure to get the creep properties curves of cushion materials. Displacement sensor acquitted the displacement deformation of the cushion materials, and the voltage was input to frequency converter (V/F) consisting of LM331 chip after signal conditioning and low pass filter. The sound card collected the output frequency signal of the converter and converted it into a digital signal. The computer read the digital signal and output the creep-time, displacement-time, force-time curves on the test software interface. The test device and software testing system had the advantages of simple operation and used the sound card of PC instead of expensive data acquisition as a data acquisition system, which reduced the cost, improved the flexibility and liability, and made the cushion material creep test more convenient and efficient, providing a powerful tool for cushioning design to better grasp the creep characteristics of cushion materials.