Crop pests are one of the main factors which increase the final production cost of agricultural products. The global population growth, rising costs of agricultural products, food storage and elimination of crop pests have led to the consumption of synthetic pesticides. The excessive use of pesticides along with failure to comply with the pre-harvest period leads to an increase in pesticide residues in crops and environment, which is a serious threat to human health, environment and food security. Therefore, economically biological ways to reduce pesticide residues are important. In this study, the effect of different concentrations of probiotic Lactobacillus plantarum sub sp. plantarum PTCC1896 on the reduction of Dinotefuran and Abamectin pesticides residue in fermented cucumbers and the development of a probiotic product was investigated. At first, the cucumbers were immersed in a 1.25 / L solution of Dinotfuran and 2 / L solution of Abamectins. Then, the concentrations of log7.7 CFUml 1- , log8.8 CFUml 1- and log 8.9 CFUml 1- were prepared from bacterium and added to 5% brine and cucumbers were then placed in a similar proportion to the brine. Pesticide residues, lactic acid bacteria count, pH and acidity were evaluated for Dinotfuran-infected cucumber samples on days of 0, 1, 2, 3, 4 and 8 and for Abamectin-infected cucumber samples on days 0, 10, 20 and 30. Samples were prepared and extracted using QuEChERS method, HPLC using UV detector were used to measure the amount of residues of both pesticides. The results showed that the bacterial inoculum concentration of 7.7 log CFUml 1- was the best concentration for reducing both pesticides. In the case of Dinotefuran, the residual concentration decreased by 77.3% from 8 ppm to 0.47 ppm (below the codex limit) within 8 days of storage, due to a significant increase in bacterial growth. Also, the residual concentration of Abamectin decreased by 83% from 1.46 to 0.24 ppm during 30 days of storage. The decomposition rate constant was calculated and it was found that the inoculum concentration of 7.7 log CFUml 1- rapidly degraded both Dinotefuran and Abamectin pesticides. The reduction of Dinotefuran and Abamectin at this concentration can be attributed to a number of factors such as the proportion of bacterial inoculation and energy source, amount of acid produced, the rate of bacterial growth and production of primary metabolites. In general it was found that Lactobacillus plantarum sub sp. plantarum PTCC1896 is able to degrade Dinotefuran and Abamectin pesticides. Further experiments are needed to apply the results of this project in industrial scale. Keywords biodegradation, Lactobacillus plantarum, fermented cucumbers, high performance liquid chromatography, probiotic, Dinotefuran, Abamectin