The invention provides a zero-watermark method for database distribution protection, and the method comprises the steps: firstly enabling a table of an original database to be recombined into different table structures and numbers L for different distribution users before database distribution, and storing the recombined table through a T-F table; secondly, carrying out zero-watermark embedding onthe recombined database by means of the thought of attribute classification, and selecting important attributes for feature extraction by scoring the importance of variables through a random forest;then, registering the generated watermark key in a certificate authority to resist the attack of confusion identity verification; and finally, when a divulged database is discovered, preliminarily judging a user distributed for the first time according to the T-F table, performing zero-watermark extraction detection on the user, and finishing final copyright judgment by comparing an extracted watermark key with a watermark registered in a certificate issuing institution, thereby realizing traceability of the first distribution. Compared with a traditional zero-watermark scheme, the method hasthe advantage that the secret divulging and tracing capacity is improved.