article 11 of the patent law stipulates that after the patent right for invention and utility model is granted, no unit or individual may exploit the patent without the permission of the patentee, that is, they may not manufacture, use, promise to sell, sell or import their patented products for the purpose of production and operation, or use their patented methods and use, promise to sell, sell or import products directly obtained according to the patented methods.
since the utility model patent is authorized in China, its patent protection is limited to the manufacture, use, promise of sale, sale and import in China, and it is related to whether the manufacture in China is legal or not. If it is legal, exhaustion doctrine will not infringe. If it is not, it will infringe if you manufacture other people's utility models.