The random amplified polymorphic DNA(RAPD) by Williams et al. (1990) is a highly reliable, simple and discriminatory method for analysing genetic relationships at different taxonomic levels. In this paper ,authors systematically discussed the RAPD technique ,and its applications in aspects of taxonomic identity,interspecific gene flow and introgression,variation identity at plant breeding programmes, genetic linkage maps and specific probe generation, and noted some difficulties in RAPD experiments. At the ...