A light trap is a method to capture the light attracted insects. Species richness and seasonal occurrence can be done by this method which leads to calculate the different biodiversity indices. Insects were collected via light trapping from January, 2018 to March, 2018 from Lake Town, North 24 Parganas, West Bengal. The most prevalent order was Coleoptera followed by Hemiptera. Coleopteran insects showed most variations with 7 families. Dermapteran insects were of poor occurrence. With the gradual rise of temperature the increase of insects was observed. The fluctuation of number of insects captured via light trapping can be correlated with temperature, humidity and other environmental conditions.