Whether there is an optimal threshold interval of gender structure of the top management team (hereafter TMT) was determined from the view of maximizing the innovation capacity of the firm. Drawing upon the social role and cognitive theories, the present study applies the panel threshold regression model to reconcile the mixed findings with regard to the relationship between TMT gender composition and enterprise innovation using the data from 187 listed electronic firms in China during the period of 2012–2016. The results indicate that the significant three‐threshold effect does exist with performing the “N” correlation between TMT gender diversity and innovation. The optimal threshold intervals of TMT gender structure in national, coastal, and inland enterprises are [1/4, 3/10], [1/5, 1/3], and [1/10, 1/6], respectively.