Vietnam is a country with a plentiful and long-standing culture, customs, and religion. These characteristics profound effects on Law on Family and Marriage. The influences contribute to the specificity, development, and humanity of the Law. However, the law itself, besides the progressive points, there are stills some regulations which are not suitable in the terms of contents and practical application. The Law ensures the freedom of keeping religion for both spouses when they decide to get married. The Law contains suitable sanctions for violation of freedom of choice in culture, customs, and religion. The sanctions include administration and criminal penalties. In addition, besides the positive influences, there are some ambiguous and rules. In the scope of the research’s content, the author applies the method of synthesis and analysis to point out the inadequacies in the Law. Based on the results, the author suggests changing and improving the Law that makes it becomes more influential and practical