The invention provides a function tree structure of a microprocessor function validate testing example and an automatic generating method. A method using the function tree structure describes a testing example, the function tree structure has clear structure layer, relationship between various indication and parameter is clear for processing description using programming language; the function tree structure is mapped to a testing example described by SystemVerilog language using Perl language automatically, only needing inputting corresponding indication according with the function tree structure can generate the testing example automatically, according, time for covering the function tree structure into the testing example is reduced and a validity efficiency is increased, and a productwithout defect come into a market can be realized in a short time; in addition, the method can increase or decrease indication or parameter according with various product based on existing function tree structure that can be suitable for generating the testing example of various product automatically, according, increase reusability of the testing example.