The effects of cooling rate (R) with crystallizing and melting behaviours of nylon 1010 and the melting of its samples which were quenched from melt at room temperature(RT) and liquid N2 (LN) and then annealed have been studied by DSC．The crystalzing temperatures are linearly decreased with R increasingr．If the crystallizations are finished above Tg，the cry-stallinities (C) are the same．When the initial temperature of crystallization >181℃，the cry-stal produced have 3 melting peaks which are about the transformation and melting of ringed and nonringed spherulites．The crystal formed within 181℃ to Tg is without the melting peak of nonringed spherulites．Heating the samples formed below Tg，there is a process of cold cry-stallization before the mehing．RT sample without annealing produces 3 melting peaks．When the annealing temperature Ta≥180℃，the samples have 2 peaks and C∞Ta LN sample without annealing has only l melting peak．When Ta>160℃，the annealed samples have 2 pea- ks．Ta≤160℃．there are 3 peaks．The lowest peak temperatures and C are both proportinal to Ta．