To meet the requirements of an embedded mechanical fault diagnosis system development, a fault tree implementation and dynamic modification method based on CPLD (Complex Programmable Logic Device) is investigated experimentally. The mechanism of fault tree logic calculation in the CPLD chip is presented. The fault logic tree is modeled by VHDL (VHSIC Hardware Description Language) and logic graphic, respectively. The effects of the bottom events on the logic result are simulated in Max + plus II platform. The fault tree logic is downloaded into the EPM7064SLC44-10 chip by ISP (In System Programmable) technology. And evaluated in terms of power consumption, system’s volume and design flexibility. The study results show that CPLD is suit to the fault tree’s construction, contributed by the chip’s outstanding ISP function and programmable logic function. And the fault tree logic synthesis and the chip resource optimization need to be further investigated.

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