It was a field and lab based research. During this research, 16 genotypes of brinjal collected from different parts of Bangladesh. In the field level, these genotypes were cultivated and coefficient of variation and correlation coefficient were determined. The phenotypic coefficient of variation was higher than genotypic coefficient of variation in most characters.Correlation coefficient was determined to find out the interrelationship among the different characters. Fruit yield per plant was positively and significantly correlated with plant height, number of branches per plant, number of fruits per plant, number of inflorescence per plant, fruit breadth and individual fruit weight. On the other hand negative correlation was observed with flowering time and fruit length. In the laboratory research, leaf sample of the genotypes was used for isozyme analysis. The electrophoresis of the proteins of leaves was carried out using Polyacrylamide Gel Electrophoresis (PAGE) technique and the gels were stained with Peroxidase (POD), Glutamate Oxaloacetate Transaminase (GOT) and Malate Dehydrogenase (MDH) isozyme and zymogram analysis was performed.