Virtually,handwriting reflects the writing skills and writing habits of the writer.The handwriting expert recognizes writing skills and writing habits through the writer's handwriting features,and then makes a deductive conclusion whether the experimental material and the sample is identical after comprehensive judgments.If there is leakage strokes phenomenon between experimental material and handwriting samples,it will reflect the writer's handwriting habits and will directly affect handwriting expert's recognition about these habits.Therefore,having a correct recognition of leakage strokes phenomenon in handwriting verification,and understanding the reason how it comes into being will make instructional significance in our handwriting verification.