As a new commercial sign,the unique icon for App logos in the mobile internet not only can identify the sources of products or services but also becomes a rare resource.The name and graphic design of the App could be unique in the mobile internet,and once being registered,the App with the same name could never be sold in the application stores.Uploading App application software in mobile internet is a new way of using trademarks.If the uploaded App is the same as others' registered trademark being used at the same products or services,it causes relevant public to confuse and leads to trademark infringement.The managers of the APP application stores who know or have reason to know the infringement subjectively but have not take any necessary measures objectively,could not apply the safe harbor rules to exempt the liability,but will be jointly liable for contributory infringement.