A C
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12 PNA analysis method for source rock study is introduced.the method involved vacuum degasification under 90°-100°C.The condition of degasification is constant,and strictly controlled.The degassing rate is high,with no distortion for separaed components.The results is proved to be representative.Meanwhile C
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5 calibration factors are determined under optimum condition.C
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10+ PNA program of HP5880 GC is worked out by revision of the original C
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12 PNA program.Thus,the full usage of the instrument is made.The method is effective for C
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12 PNA component study.