Abstract:the design of drug is the initial stage of life cycle of a drug, and it is also a key link to control the risk of drug. The design of Nano-drug will be to realize the risk control of the "origin the method of value sensitive design used to design process showed the consciousness of responsible innovation of designers. The responsibility of designers objectively caused by the structure effect and size effect of nano-preparation not only includes the responsibility of the technical assessment (TA) related to risk of nano-drug, and but also need to study a system of constructive technology assessment (CTA) linking with risk from the constructivism perspective. The theory basis for constructing risk assessment of nano-drug is the humanism theory of Marxism and stakeholder theory. The designers of nano-drug implement the path of responsible innovation should pay attention to promotion of knowledge, codes of ethics, legal constraints and policy orientation in four dimensions.