Making use of Klein-Gordon equation,thin film brick-wall model and WKB approximation,we find the entropy of Vaidya-Bonner black hole and this entropy is proportional to the area of event horizon.

• 利用Klein Gordon方程和薄膜Brick Wall模型 ；并采用WKB近似方法 ；求出了Vaidya Bonner黑洞的熵 ；所得的熵正好与该黑洞的视界面积成正比 .