Answer: In principle, the submission of design patent applications is one design and one application. Paragraph 2 of Article 31 of the newly revised Patent Law stipulates that two applications can be combined (i.e. filed as one application) , and charges are based on one application): (1) Two or more similar designs for the same product; (2) Complete sets of products. Which designs can be applied for jointly? (1) Similar designs must be for the same product. Generally speaking, after overall observation, if other designs and the basic design have the same or similar design features, and the differences between the two usually lie in local subtle changes, the usual design of this type of product, repeated arrangement of design units, or If there are only changes in color elements, the two designs will be deemed to be similar. (2) A complete set of products refers to two or more (including two) products that belong to the same category and are independent. Each product has the same design concept. Each product has independent use value, and each product combination Products that together reflect the value of their combination, such as coffee utensils consisting of a coffee cup, a coffee pot, a milk jug and a sugar bowl. It should be noted that a patent application involving a complete set of products can no longer contain two or more similar designs for one or all sets.