The invention relates to an RT-
PCR method for quantitatively detecting miRNA. The method is characterized in that Poly (A)
tail adding and reverse transcription of miRNA are performed in the same
reaction system, and S-Poly (T) primers are used to perform the reverse transcription of miRNA. The method has the advantages that in an S-Poly (T) Plus method, the Poly (A)
tail adding and reverse transcription of miRNA are simultaneously performed in the same
reaction system, simple operation is achieved, time is shortened, time for synthesizing cDNA is at least reduced by 0.5 hour, and high reverse transcription efficiency is achieved; an S / P miRsol
RNA method and the S-Poly (T) Plus method are combined to build a technical
system which is quite sensitive, efficient, simple, fast and cheap and capable of achieving extraction and detection; the technical
system is especially suitable for detecting miRNA in
biological fluid samples with low miRNA abundance.