Abstract: Pilot and demonstration plants(PDP) is an important way towards the transformation of scientific and technological achievements, but there are few literature on the cooperative and management of PDP in enterprises. Started with the qualitative research of single case-PDP operation and management of Shaanxi Heavy Duty Automobile Co. Ltd, based on phenomenon capture, description, document and conceptualization of the main factors involved in PDP operation and management, the Important relevance between PDP effectiveness and both internal and external innovation networks was found. Through theoretical derivation, the hypothesis that internal and exterior innovation networks effect PDP effectiveness was proposed. Questionnaire is designed for large sample survey in the Shaanxi Heavy Duty Automobile Co. Ltd. The result shows that both the trust of internal innovation network and the external innovation network have positive impacts on the PDP effectiveness. However, External innovation network exerts more considerable influence, and their interactive makes operation of PDP more effective. To provide practical evidences for the acquisition, utilization and combination of elements in realization mechanism for effective operation of PDP is helpful to further clarify the process, system and structure of PDP management.