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The dynmcal electron scattenng effects by a hexagonpnsm PSi3N4 whisker were inv&gatdThe 002 dark field mags of the w i g s of the wh~sker along [liO] mrecbon showed snusoidal fnnges in whch there msted great d~fferences in fnnge pencd under two-and N-beam conditions Fine structures of the cor mpondmg d~ffiaction spots under t w d " cond~tion were also v q dffemt from those under many-beam cond~tion. Such dynamcal scattenng effects were analyzed quanataavely