i wish to purchase some medical ecquipments and biocemistry analyser in beijing.please guide.

For the medical equipments, I think you can go to the local drug stores to buy if you do not want to buy in wholesale. Quanxin Drug Store, on the opposite of the Wangfujing Drug Store is the one I usually go to. Would you mind tell me where you stay, so I may help you to find a close drug store.
For the biochemistry analyser, I am not very clear. I suggest you to ask the staff in the drug store to help you and I am sure you can get some help from them.