Main differences: 1) Protection scope: Hong Kong trademarks are only valid in Hong Kong, domestic trademarks in mainland China; 2) Registration period: Hong Kong typically 6-8 months, domestic 8-12 months; 3) Legal system: Hong Kong follows common law, domestic follows civil law; 4) International recognition: Hong Kong trademarks have higher international recognition.

Basic materials include: 1) Trademark design; 2) Applicant identity documents (personal ID/company business license); 3) List of goods or services; 4) Power of attorney (if using agency). Hong Kong and domestic requirements differ slightly, we'll provide detailed list based on your needs.

After registration: 1) Must be actually used within 3 years to avoid cancellation; 2) Pay attention to renewal time, valid for 10 years, need renewal before expiration; 3) Monitor market to prevent infringement; 4) If information changes (address, name etc.), update registration promptly. We provide comprehensive trademark maintenance services.

Advantages of dual registration: 1) Save time by initiating applications simultaneously; 2) Unified management with clear progress; 3) More cost-effective, saving 15%-20% compared to separate applications; 4) Professional team coordination to avoid issues from regional differences; 5) More convenient follow-up maintenance. Especially suitable for businesses expanding in both Hong Kong and mainland markets.