This product is a freeze-dried fluorescent PCR detection reagent for detecting parainfluenza virus, suitable for qualitative detection of parainfluenza virus nucleic acid in samples in vitro. The single-reaction reagent kit is packaged in a PCR tube and can be directly loaded onto the instrument for use. The single-reaction reagent kit contains all reaction components and can be detected on the instrument by adding sample DNA during the operation process, eliminating the need for cold chain transportation and storage. This product is easy to use, effectively avoids loss and aerosol contamination, and is particularly suitable for rapid on-site detection.