建议您提前1个月递交签证申请，但不得早于3个月。因为中国签证的入境有效期一般为3个月，如果过早申请，签证可能会在您出发之前就过期失效。
例如，如果您准备在7月1日入境中国，最好在6月1日左右递交签证申请。
请注意，某些种类签证的入境有效期只有1个月或少于1个月，您可能需要提前2周左右申请签证。

It is recommended that you submit your visa application one month in advance, but not earlier than 3 months. As the entry validity period of a Chinese visa is generally 3 months, the visa may expire before you leave in case you apply premature. For example, it is best to submit your visa application around June 1 if you are ready to enter China on July 1. Please note that some types of visas are only valid for one month or less, and you may need to apply for a visa about 2 weeks in advance.