Abstract:  Aiming at the technological advancement difficulties and technical thresholds faced by China′s large and medium-sized industrial companies in their own R&D innovation and from the perspective of technical capabilities of enterprises, threshold model is constructed, in which independent R&D innovation drives the promotion of total factorial productivity(TFP), the threshold effect of technical capabilities in different steps of independent R&D innovation is examined, and also the relationship between independent R&D innovation and TFP is clarified. Results show that there are obvious double threshold effects where independent R&D innovation of large and medium-sized industrial enterprises drives TFP. With improving technical capabilities, the effect of independent R&D innovation on the promotion of TFP turns positively significant, whether from the knowledge learning capacity, the knowledge output capacity or the conversion capacity. What′s more, the positive impact of knowledge output capability is the strongest, followed by knowledge learning capability, and the conversion capacity is the weakest. At the same time, technical capabilities show heterogeneity in time and space.

Key words: independent R&D innovation, total factor productivity(TFP), technical capability, threshold model