This product can directly store large pathogenic samples or specific tissue samples, such as bronchoalveolar lavage fluid, tissue homogenate, cerebrospinal fluid, pus, hydrothorax and ascites, pleural effusion and pleural effusion. the samples can be preserved at room temperature for 1 week and the nucleic acids in the samples are intact and undegraded. After nucleic acid extraction and purification, various molecular biology experiments can be carried out.