In this research we apply questionnaire as the testing method and the seven hundred and fifty six Chinese chefs in Taipei cith county as the subjects. The intention of this study is to identify the divergence of their working knowledge within various backgrounds and to discover the factors which may affect the degree of the knowledge. We also apply methods of frequency proportions, one-way ANOVA, and stepwise multiple regression analysis for tests. The result shows that the personage of scoring is 76.6 in working knowledge. Overall in this aspect, female Chinese chefs score higher than male ones; chefs graduated from high schools or vocational schools display better than those graduated from junior high schools; chefs with certification rate higher than those without one; chefs with C level of certification rate higher than those without one. Morover, Chinese chefs employed in Taipei city obtain much higher score than those in Tipei county. Sex, educational level, and chef certification can effectively calculate the working knowledge of Chinese chefs.