金融复杂性科学、金融工程和金融物理学。近年来，研究方向包括金融市场的微观结构、金融复杂网络和风险管理研究，主要关注微观结构下交易人的交易行为及其经纪人模型，宏观和微观尺度下的金融网络分析，基于大波动极端事件的市场风险度量。

1.Ren F and Zhong Li-Xin, Price impact asymmetry of institutional trading in Chinese stock market, Physica A 391（2012）, 2667-2677.

2.Ren F and Zhou W X, Recurrence interval analysis of trading volumes, Phy.Rev. E 81 (2010), 066107.

3.Ren F and Zhou W X, Recurrence interval analysis of high-frequency financial returns and its application to risk estimation, New J. Phys. 12 (2010), 075030.

4.Ren F, Zheng B, and Wen LY, Modeling interactions with trade volume in financial dynamics, Physica A 389（2010）, 2744-2750.

5.Ren F, Gu G F, and Zhou W X, Scaling and memory in return intervals of realized volatility, Physica A 388 (2009) 4787-4796.

6.Ren F, Guo L, and Zhou W X, Statistical properties in the volatility return intervals of Chinese stocks, Physica A 388 (2009) 881-890.

7.Ren F and Zhou W X, Multiscaling behavior in the volatility return intervals of Chinese indices, EPL 84 (2008), 68001.

8.Ren F and Zhang Yi-Cheng, Trading model with pair pattern strategies, Physica A 387 (2008), 5523-5534.