This interface card is designed to collect the signals of linear encoder sensor. The users only need to insert the card into the ISA or PCI slot of PC to obtain the measurement data of three-coordinate data in real time through the dedicated software provided by the company. The input frequency of each axis is 5MHZ. If the linear encoder with 1μm resolution, the sampling speed shall be over 6m/s. It can be used for high-speed mobile displacement detection and feedback of three-coordinate measuring machine, detection instrument and dedicated devices for measurement.