As the development of manufacturing industries is the key impetus of the Beijing economy development, so we clarify the comprehensive competence of each industry that belongs to Beijing manufacturing industries, on the purpose of estimating and selecting primary industries for cultivating and developing them preferentially. Therefore, this paper applies a principal components analysis to assess the comprehensive competence ability of each industry which belongs to Beijing manufacturing industries in terms of the industries expenditure of science & technology, the industries technology innovation ability, industries economy creative ability, industries contribution ability to society and industries energy consumption ability.