This paper presents the first systematic study of the political behaviour of female members of China's national legislature, the National People's Congress (NPC). Women held 23 per cent of seats in the 12th NPC, yet they sponsored 44 per cent of all legislative bill proposals and more than half of the bills relevant to women's interests. Women sponsored more bills (4.8 bills) than did men (3.1 bills). We propose that there are two mechanisms driving women's outperformance: (i) women are more collaborative than men, and (ii) female leadership encourages female participation. We analyse 2,366 bills and show that women are disproportionately more active than men in all issue areas and are particularly engaged with women's issues. Our findings demonstrate that underrepresented regime outsiders (women) can carve out a space to amplify their voices, outperform insiders and shape policy direction to a certain extent within an authoritarian legislature.