主要从事算子理论和算子代数的研究，在国内外学术杂志上发表文章30余篇，论文主要发表在“Studia

Math.”，“Proc. Amer. Math.Soc.”，“J.Math.Anal.Appl.”，“L.Alge.Appl.”以及“Acta Math.”等

期刊上，目前主持教育部项目一项，入选教育部2006年新世纪优秀人才支持计划。

代表作：

1. Xiaohong Cao, Maozheng Guo and Bin Meng, Weyl spectra and Weyl’s theorem, J. Math. Anal. Appl.,2003, 288(2),758-767.

2. Xiaohong Cao, Maozheng Guo and Bin Meng, Weyl’s theorem for p-hyponormal and M-hyponormal operators, Studia Mathematica, 163(2), 2004, 177-188.

3. Xiaohong Cao and Bin Meng, Essential approximate point spectrum and Weyl’s theorem for operator matrices,J. Math. Anal.Appl.,2005, 304,759-771.

4. Xiaohong Cao, Maozheng Guo and Bin Meng, Weyl’s theorem for upper triangular operator matrices, Linear Algebra and Its Applications,2005,402,61-73.

5. Xiaohong Cao, Maozheng Guo and Bin Meng, A note on Weyl’s theorem, Proc. Amer. Math. Soc., 2005,133,2977-2984.

6. Xiaohong Cao, Analytically Class A operators and Weyl’s theorem, J. Math. Anal. Appl., 2006, 320, 795-830.

7. Xiaohong Cao, Weyl’s theorem and hypercyclic operators, J. Math. Anal. Appl., 2006, 323, 267-274.

8. Xiaohong Cao, Topological uniform descent and Weyl type theorem, Linear Algebra and Its Applications, 2007, 42(1), 175-`182.

9. Xiaohong Cao, Weyl type theorem and hypercyclic operator II, Proc. Amer. Math.Soc., 135 (2007), 1701-1708.

10. Xiaohong Cao, Browder essential approximate point spectrum and hypercyclicity for operator matrices, L. Alge.Appl., 426(2007), 317-324.