The FSC certificate is valid for five years, but the certification body recognized by FSC will conduct annual supervision and audit to verify whether the company continues to meet the requirements of FSC certification. Forest certification includes two basic contents, namely, forest management certification (FM forest management certification) and chain of custody certification (COC forest chain of custody certification). FM is a forest management certification, which is suitable for forest management units. CoC is a chain of supervision and certification of production and marketing, which refers to the path of harvesting, processing, manufacturing, selling, printing, completing and selling raw materials from FSC certified sources to final consumers.