For control process in the systems of differential equation with constant lag necessary condition of optimality of singular control is found.
对带有常数滞后的微分方程系统的控制过程，我们给出了最优性的必要条件。
Two optimality functions for above optimal control models arc introduced, and the cquiva-lence between the optimality function and the one-order necessary optimality condition is concluded.
定义了最优控制问题的最优性函数，并证明了最优性必要条件与最优性函数的零点等价的结论。
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