Abstract:Based on the theory of trust, perceived risk and innovation openness, this paper constructs a conceptual framework that influences SMEs" purchasing intention of science and technology services, and puts forward research hypothesis to prove it. Taking 324 SMEs in Ningbo as samples, the results show that: supplier trust (including cognitive trust and emotional trust) has a significant positive impact on the purchasing intention of science and technology services of enterprise. While perceived risk has a significant negative impact on the purchasing intention of enterprises" science and technology services. Supplier trust and perceived risk of science and technology services exist a significant negative correlation between them, and the dimension of emotional trust has a higher correlation. Also, innovation openness has a significant moderating effect on the relationship among supplier emotional trust, perceived risk and enterprises" purchasing intention of science and technology services.