Abstract: Based on factor analysis，a dishes assessment method is proposed for a kind of teaching-playback cooking robot.Firstly，the relationship between the teaching-in system and the dishes assessment method is introduced in the cooking robot.Secondly，the general mathematical model of the factor analysis is described.Finally，based on factor analysis，a dishes assessment method is proposed，and the main factors are explained.It solves the problem of how to analyse dishes scores in teaching-in system.A lot of experiments prove that this method can extract main factors efficiently，and can meet the need of robot’s data analysis.