A simple validated Gas Chromatography-Flame Ionization (GC-FID) method has been created for a mixture of insecticide and a chemical separation and quantitative measurement of Transfluthrin, Piperonyl butoxide, and Cyfluthrin formulation. Because it is time-saving, dependable, cost-effective, and repeatable, this GC approach is required. Developing a simple and cost-effective approach is difficult; yet, a GC analytical method validates one's capacity to meet regulatory / SANCO standards. In the current scenario, this pesticide mixture is necessary to manage all pesticides with a single dose application. Insecticides like Transfluthrin, Piperonyl butoxide, and Cyfluthrin are used to efficiently manage insects in crop plants. There are limited separation and determination analytical methods for such an important application of combined pesticides. The simple analytical instrument GC with Flam Ionisation Detector (GC/FID) was used to detect 0.01ppm LOQ level, this approach analyses Transfluthrin, Piperonyl butoxide, and Cyfluthrin mixtures. A Rxi-5ms capillary column was used to isolate these three compounds. A 30m capillary column with a 0.25mm ID and 0.50m length was loaded into the Shimadzu GC (model: GC-2010). A pre-installed, confirmed GC solution software equipped Shimadzu instrument was used for separation and quantification, as well as data processing and computations. These three chemicals were identified and quantified separately. In a single study, the simple GC method provides a quick way to determine the total amount of these three compounds