Abstract: Comparison of the introduced pecan seedling varieties for 13 years,screening out Annong No. 1 and other 4 suitable varieties,then observe and analyse the new branches and leaves on germination and growth rhythm, male and female flowers flowering phenology, flowering duration and other characteristics of these 5 varieties.The results showed that five species differences in the average length of new branches reach 6.5cm, leaves the average difference in length 3.3cm; The largest amount of branches, leaves and male inflorescences when the highest temperature date; Five varieties of male flowering duration has smaller difference;The female flowers of annong 1 bloom lasts 10 days, longer than the other four varieties of 3 to 5 days;Female flower and male flower of Annong 1 ,Annong 3 and Annong 5open at the same time , Annong the 2nd of the first female varieties , Annong 4 as hung variety.While female flowers of annong 2 open first ,annong 4’male flowers open first .