In order to clarify the selectivity of beam shrimp trawl for Parapenaeopsis hardwickii and Solenocera melantho, the authers conducted the selectivity tests of different mesh sizes in December 2018 and March to April 2019, respectively. The results showed that: In December, the experiment mainly focused on catching Parapenaeopsis hardwickii, whose body length ranged from 35 to 100 mm,with an average body length of 66 mm; in the experiment from March to April, the main fishing was Solenocera melantho, whose body length ranged from 30 to 140 mm, with an average body length of 60 mm. with the increase of mesh size, the average body length of Parapenaeopsis hardwickii increased from 71 to 74 mm, and the average body length of Solenocera melantho increased from 64 to 74 mm. The mesh size had a significant effect on the body length of the two types of shrimp. When the mesh size for Parapenaeopsis hardwickii was 25mm、28 mm and 38 mm, its L50 was 55.334 mm、57.396 mm and 68.319 mm; when the mesh size for Solenocera melantho was 22 mm、25 mm、28 mm and 38 mm, its L50 was 54.919 mm、62.734 mm、72.807 mm and 74.819 mm. The equations for the relationships between mesh size of the codends and L50 for Parapenaeopsis hardwickii and Solenocera melantho, respectively, are as follows: L50=1.023m+29.331 (R2=0.995)，L50=1.134m+34.280 (R2=0.724). As the mesh size of codends increased(25～38 mm, 22～38 mm), the selectivity curves of both Parapenaeopsis hardwickii and Solenocera melantho shifted sequentially to the right, and the selectivity curves both showed crossover phenomena, which were inseparable from the body shape characteristics of the shrimp. In order to release shrimps with body length less than 70 mm, it is recommended that the mesh size of codend should not be less than 39.75 mm during the main catch of Parapenaeopsis hardwickii; The mesh size of codend should not be less than 31.50 mm during the main catch of Solenocera melantho. The results of this study can provide reference for the management of beam shrimp trawl and the protection of two kinds of shrimp resources in the East China Sea.