本人大三升大四...打算申Mphil，但是心里没有什么底，因为官网在录取方面说的也不多，而且认识的我们系升上HKU的学长都是Msc的，我想请问一下有没有Mphil的在读生能说一下录取条件方面的东西给个参考？Computer Science的方向，非常感谢!

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much harder than phD, not to say MSc.
But if you choose self-financed, it becomes easier.Though still hard.

If you have applied for the early entry scheme or summer intern programme, you will stand a better chance to get admitted.
For the selection phase, usually after passing the interview with the graduate panel and departmental research committee, related supervisors will consult with you about your tentaive supervisors, research group/domain/topics and the degree(encourage you to transfer to Ph.D degree).
The CS department will recommend about 5 candidates who confirm their admission to HKU for 100 percent to RPG for the HKPFS.
More info(like the research groups, academic faculty) could be reached on CS website.

FYI: http://www.cs.hku.hk/