红军挺进师和中共闽浙边临时省委在南方三年游击战争期间，在较闭塞的斗争环境里，及时果断地实现了由土地革命战争向抗日战争的战略转变。本文根据当时的历史环境和具体的转变过程，较全面地分析了战略转变得以及时实现的原因。 During the three-year guerrilla war in the south, the Red Army advance division and the interim provincial party committee under the CPC Fujian and Zhejiang sides made a timely and decisive realization of the strategic change from a land revolutionary war to an anti-japanese war in a relatively closed fighting environment. Based on the historical circumstances and the specific process of change, this article analyzes the reasons for the timely realization of the strategic change.