Hello,
I major in Jurisprudence and Criminal Law, and decide to apply for these four schools for 2011~2012 admission.
Does anyone know which one has better reputation in Jurisprudence and Criminal law?

If youre thinking about LLMs (or MJURs and BCLs the names Oxfords given to their LLM programmes, depending whether youre coming from a civil or common law background), Id rule out Cambridge and Oxford for Criminal Law. If you take a look at the modules on their websites, youll see you havent got many options to choose from for Criminal Law and Jurisprudence. Oxford, on the other hand, has the MSC in Criminology and Criminal Justice that is a more specialised degree and may be the best of lot. UCL and LSE are great schools with a good variety of courses to choose from in these fields you want and I think they are pretty much on the same level LSE might be slightly held in higher regard outside the UK.

I'd go for Oxford and Cambridge. They are the most prestigious universities in the UK, and prestige cannot be overestimated with regard to an LL.M. (/MJur). Honestly, I really think that for this degree, the general reputation is what really matters in the end.

I do agree with Dutchman to a certain extent, but Cambridge has very little options to choose from for Criminal Law and Jurisprudence. Thats why Id cross Cambridge off. Reputation may be everything when it comes to LLMs, but forcing someone to study what they do not want to just because of reputation would be pointless in that case, its better to do something else with the sizeable amount of pounds youll spend on your LLM. The same happens with Oxfords Mjur/BCL. But Oxford, like I said before, has the MSC in Criminology which would be the best option for our colleague because it joins reputation and a good variety of modules Either way, if you end up in London (like I did), no need to cry your eyes out thinking youre binning your money. LSE, UCL and KCL are excellent law schools too, but of course will never measure up to Oxbridges reputation especially because of the hundreds of years Oxbriges been around.

I think beicon is quite right here. If you really, really want to do Criminal Law and nothing else, then there might be better options than a general LL.M. The MSc in Oxford certainly would fit your interests. I just think that the general reputation of the university clearly is one of the most important factors when it comes to LL.M. degrees. Few people will ask you about your spezialisation later on, but they'll always see the name of the university attached to your title!
(Of course, LSE and UCL are really excellent and prestigious universities as well!)
What I would like to correct with regard to beicon's comment, however, is that you shouldn't cross Cambridge off your list, as they also have a special M.Phil. in Criminology:
http://www.law.cam.ac.uk/courses/mphil-in-criminology.php

Thanks, Dutchman. Cambridges MPhil is also a good choice. But that would be a research degree, rather than a taught one, wouldnt it? Anyhow, its a great choice also for someone who wants to focus on Criminal Law. And regarding and specialisation the reputation things, I agree with you.

Thank you both, I deeply appreciate your answers.