Yes, when applying for NMPA (National Medical Products Administration) certification in China, it is typically necessary to submit evidence of sales or distribution in the Chinese market, especially if you're seeking to register an existing product. This evidence can include sales contracts, invoices, and other documentation that demonstrates market presence and commercial activity.

For new products, while direct evidence of prior sales might not be required, the application must still include comprehensive data on market potential and justification for the product's introduction in China. It's essential to thoroughly prepare your documentation to comply with NMPA requirements, as the agency places significant importance on market analysis and product viability.

If you're looking for specific guidance related to your product, feel free to ask!