This standard is a method specification used to regulate the testing process for the anti-algae performance of plastic materials. Its core objective is to evaluate and compare the anti-algae capability of plastic products by simulating the growth environment of algae. Specifically, the standard defines the essential elements required for conducting the tests, including the selection of algae species, the preparation methods for test samples, environmental conditions such as light and temperature to simulate algae growth, and quantitative evaluation metrics for results such as the density and coverage of algae growth on the plastic surface. This method is applicable to various plastic materials that require assessment of anti-algae performance. In practice, the implementation of the standard typically relies on specialized biological cultivation testing equipment, such as constant-temperature light incubators for cultivating algae, as well as instruments like microscopes that may be used for observing and evaluating algae attachment.