Abstract: By using the modularized and hierarchical algorithm of majority judgement,the most simplified combination logic diagram of digital circuit of 11bit majority judgment is designed.That is,11 input variables are divided into groups and the logic relationships in each group are structured respectively.Then,the numbers of the variables are reduced hierarchically by step.Finally,the output is decided after handling the 6 outcome variables via majority judgment.To verify the effectiveness of the design,the programme is composed and its function is tested and checked by samples in simulation software Modelsim.The simulation result shows that the designed digital circuit can realize the function of 11bit majority judgment at the lowest cost.