Twelve pure silkworm lines identified based in higher G.C.A values from a line${ imes}$Tecter crossing programme, were crossed with twelve breeds showing cocoon shell ratio>22% and hybrids prepared, evaluated in a Multiple index method. Seven hydrids showing average index value>50 in all the 10 economic characters were seclcted and evaluated in the laboratory. However, two hybrids viz., A3${ imes}$935E and A3${ imes}$916B were finally selected based on the superiority of the breeds in one day shorter larval duration and with and with higher reeling characters compared to control KA${ imes}$NB4D2. The breeding procedure involed in evolution hybrids are discussed.