The mistake in the proving process of the problem of deciding BCNF in reference[1] is pointed out,and a polynomial time algorithm to decide whether a relation schema is in BCNF is given.

• 摘要文中指出了文献[1]中对BCNF判定问题证明过程的错误之处，通过分析属于BCNF的关系模式的结构特点，给出了一个判定关系模式是否属于BCNF的多项式时间算法.