Why had modern science not developed in Chinese (or Indian) civilization but only in that of Europe? This paper reviews several famous explanations for the above problem, and questions the views held by Jin Guantao, Fan Hongye and Liu Qingfeng. The paper further points out that the Needham puzzle involves complex historical events which are irreversible and the scientific enterprise is a social one or even of the whole humankind. Under these circumstances, to explain Needham puzzle Ⅰ, a taxonomical theory about the social system has to be i...