Unless others have made corresponding improvements based on your original one, they cannot apply again with the same technical solution you used before. Of course, because there is no substantive examination procedure for utility model patents in China, others are not excluded. It is possible to obtain re-authorization by re-applying, but even if it is authorized, it may be invalidated by others using previously published patent documents. It is recommended that you conduct a search based on the original patent, which can be used on the website of the State Intellectual Property Office. Keyword search found!