针对有界区域上的抛物型微分方程讨论了Crank-Nicolson块中心差分法,在非等距剖分的网格上得了近似解和解的一阶导数的L2模误差估计-For a bounded region of parabolic differential equations discussed the Crank-Nicolson central difference blocks, in a non-equidistant grid had split the approximate solution of the first derivative of the settlement of L2 Error Estimation