Renmin's Financial marjor is naturally the best one in China. you'll understood it after you knww that a lof of Remin's alumnis are now working in important position in Centre bank, Secretary Ministry etc. by the way, I think it is depending on your career in future as well for choose the suitble one for you, marco finance of course Renmin and PKU, however Computational finance is better in Tsinghua. Just in my opinion the ranking are: Renmin, PKU, Tsinghua, Fudan, Nankai. why Nanki can ranked in top 5 coz if an institute is good at math especially in probability field, the finance must be good. think about princeton.
(Sorry now I'm in office couldn't type in chinese.)