One thing the universities will care about subject-wise is the core subjects, typically classical mechanics, electricity and magnetism, quantum mechanics and statistical mechanics. If you majored in Electrical Engineering (which is what you mean by EE, yes?), then presumably you should have most of the mathematical skills that physics students are expected to have, and you hopefully are pretty familiar with Maxwell's Equations and how to solve them, which means you should have Electricity and Magnetism pretty covered. I'm not sure how EE programs are structured, but I assume you also learned quantum mechanics (and its application to semiconductors). If so, that will help too. I would think that even EE's have to take intro physics, so you should have some basic classical mechanics covered. If you know the math behind LRC circuits very well, then you should have the harmonic oscillator in classical mechanics pretty much covered, because it's the same math. If these assumptions are all correct, then off the top of my head, the main topics you will be lacking in degree-wise are special relativity, the lagrangian formulation of classical mechanics, and statistical mechanics. If you have taken thermodynamics, then that may be a sufficient prerequisite to take an upper-undergraduate stat-mech class, but otherwise, these are all topics you should be self-studying and you should probably point out you have studied all the topics you are lacking in your application. Note that unless you want to go to grad school to study general relativity or string theory, no committee will care if you haven't studied it at all.
The other, and perhaps more important, thing that admission committees tend to look at is your research aptitude. They want to make sure you will be a successful researcher, so if you can prove that you have done good research work, it maygive more weight to your application versus and application with a physics bachelors and slightly better GRE scores, but no research experience. (This is not a guarantee). So, if you can demonstrate that you have excellent research abilities, this will really help your application. Depending on what you will be doing on your job, you may be able to use that experience. I suppose it will help if the research you want to be doing during your Ph.D. is related to EE or will use a lot of the knowledge you acquired in your EE degree (but if not, don't lie - that's not going to be beneficial to anybody).
Also, as mentioned in that last paragraph there, the committees will want to know what you can do for them better than what a physics bachelors student can do, so if you can convince them that your EE experience will give you an edge in some way over another candidate with a physics bachelors, that can't hurt your application (presumably). Heck, on the one hand, you are competing with a bunch of other Chinese physics B.Sc. applicants, which may lower your chances, but on the other hand, you are probably not competing with so many EE applicants, so who knows, maybe your EE degree can help you stand out from the crowd of Physics B.Sc. applicants - but, you'll still have to convince the committee that you deserve a spot.