In this paper , we consider the correlated risk processes with negative risk sums . we define the correlation between the two classes of insurance business as the thinning dependence structure . we mainly study how the dependence between the two classes impacts on the ruin probability 本文引入了一類相關負風險和風險過程,負風險和類之間的相關性由稀疏相關結構定義,主要研究類之間的相關性對破產概率的影響。