【摘要】 阐明了标准大爆炸核合成（SBBN）模型的理论和观测状况，着重讨论了1994年的最新进展：已有3位有效数字的4He丰度原初值Y4P与由银河系观测推得的D＋3He丰度原初值Y23p间出现矛盾的可能性，使SBBN模型面临考验；高红移吸收云中氘丰度测量的有关结果与原有Y23p显著矛盾，而与Y4p偏小的趋向相洽，可能对银河系化学演化模型提出质疑。因此，河外HⅡ区中氦丰度和高红移吸收云中氘气丰度的进一步测量以及D和3He丰度化学演化的研究值得重视。更多还原

【Abstract】 The theoretical and observational aspects for standard big bang nucleosynthesis (SBBN) model have been expounded. The latest progress in 1994 has been emphasized and discussed:as the primordial 4He abundance, which has been determined to three significant digits, might conflict with the primordial D+3He abundance deduced from the Milky Way observations and chemical evolution theory the SBB model may be confronted with severe test. The result of possible detection of D abundance in low metalicity QSO absorption spectrum with high redshift apparently conflicts with the present value for primodial D+3He abundance, but accord with the trend of getting smaller of Y4p, which might put the Milky Way chemical evolution theory in question. Therefore the further observations of 4He abundance in extragalactic HⅡ regions and D abudance in high redshift absorption clouds together with the research of chemical evolution of D and 3He abundance are invaluable更多还原