Objective To study DNA quantification and STR typing of samples pre-treated with pyrami-don. Methods The blood samples of ten unrelated individuals were anticoagulated in EDTA. The blood stains were made on the filter paper. The experimental groups were divided into six groups in accor-dance with the storage time, 30 min, 1 h, 3 h, 6 h, 12 h and 24 h after pre-treated with pyramidon. DNA was extracted by three methods: magnetic bead-based extraction, QIAcube DNA purification method and Chelex-100 method. The quantification of DNA was made by fluorescent quantitative PCR. STR typing was detected by PCR-STR fluorescent technology. Results In the same DNA extraction method, the sample DNA decreased gradually with times after pre-treatment with pyramidon. In the same storage time, the DNA quantification in different extraction methods had significant differences. Sixteen loci DNA typing were detected in 90.56% of samples. Conclusion Pyramidon pre-treatment could cause DNA degradation, but effective STR typing can be achieved within 24 h. The magnetic bead-based extrac-tion is the best method for STR profiling and DNA extraction.%目的：探讨氨基比林血痕预试验处理血痕后样本DNA含量的变化及对STR分型检测的影响。方法10名健康无关个体EDTA抗凝血液制成滤纸血痕，氨基比林血痕预试验检测，按试验后血样干燥保存时间分30 min、1 h、3 h、6 h、12 h、24 h共6个实验组，并采用磁珠法、QIAcube DNA纯化法、Chelex-100法三种方法提取样本DNA，应用荧光定量PCR检测样本DNA含量，PCR-STR荧光技术进行STR分型。结果提取方法相同时，氨基比林血痕预试验后血样随干燥保存时间的延长，样本DNA含量呈逐渐降低的趋势。保存时间相同时，不同DNA提取方法间，样本DNA含量差异也有统计学意义。90.56%样本均可获得16个STR基因座明确分型。结论氨基比林血痕预试验对血痕样本DNA有损伤，24 h内多可获有效STR分型。磁珠法提取样本DNA进行STR分型，效果最好。
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