Abstract: The correlativity between the various characters of i ndividu al plant of Amaranthns hypochondriacus and its yield was analysed by the method of Grey corr elatviiy.The result shows the main factors affecting the yield of individual pla nt and the different relativiiy among the various factors.It gives some useful r eference to the breeding of the new cultivated variety and the establishing of r easonable cultivated measure.