A microlenses array beam expander system was design based on the infrared jamming technology with two jamming light paths.The microlenses array was fabricated by melting photoresist technology,the energy collection efficiency of the jamming simulation system was tested.The results show that the tested energy collection efficiencys of two jamming light paths are 27.3% and 26.9%,which are consistent with the design result 30.8%.This study verifies the application value of microlenses array as the beam expander element in the infrared jamming simulator and can provide references for the engineering research of infrared imaging simulation technology and infrared imaging target simulator with multiple jamming light paths.