Due diligence is non-negotiable when selecting a manufacturing partner in China. This step-by-step guide walks you through verifying business licenses, checking factory certifications (ISO, BSCI, Sedex), and conducting on-site audits. We explain how to use tools like the National Enterprise Credit Information Publicity System, request samples, and validate production capabilities. Red flags to watch for include mismatched addresses, reluctance to provide documentation, and unrealistic pricing. Protect your investment by thoroughly vetting every potential supplier.