Abstract: Trade credit financing still accounts for a considerable proportion of corporate financing in China. In order to further reveal the influence law of supplier concentration and non-standard audit opinions on corporate trade credit financing, and the impact of the two when jointly acting on corporate trade credit financing, this paper takes A-share listed companies as a sample and uses panel data fixed effect model to test the relationship between supplier concentration, non-standard audit opinions and trade credit financing. It is found that the supplier concentration is negatively related to the trade credit financing; non-standard audit opinion is negatively related to trade credit financing in the following year; compared with the supplier concentration, non-standard audit opinions have stronger negative effects on the scale of trade credit financing; the supplier concentration is complementary to the nonstandard audit opinion, which can reinforce the negative effect of the supplier concentration on the scale of trade credit financing; the related party relationship between enterprise and supplier will weaken the negative effect of supplier concentration on trade credit financing, which is more obvious in the face of non-standard audit opinion. The above conclusions have implications for the financing management and strategy of corporate.

Key words: supplier concentration, non-standard audit opinions, trade credit financing, related party relationship