Abstract: There is enormous quantity of shrimp in China and it has great value of development and utilization.The peeling of the shrimp is mainly by manual labor at present, and the mechanized peeling technology of shrimp in China is still on a preliminary?stage.Mechanical manipulation methods are being studied to improve the production efficiency and to extract the integral meat of shrimp.Shrimp processing time is relatively concentrated and labor resources are in shortage, which can not meet the needs of large-scale production of enterprises.Therefore the research of shrimp mechanical peeling has important significance and solving the problem of shrimp peeling mechanization is an important direction of development.Preliminary study results show that the method of roll-type extrusion peeling is good.Comparing the effects of dual-roller extrusion peeling and five-roller extrusion peeling, the peeling device with 5 rollers had the advantage of high peeling efficiency, so it would be widely applied for peeling shrimp.In order to further study the shrimp peeling machine and improve the work quality for the shrimp peeling machine, the adjustable five rollers peeling machine was designed.The study took the fresh Litopenaeus vannamei with a number between 70 and 80 per kilogram as the study object.In order to determine the operation parameters of the adjustable five rollers peeling machine, the response surface experiment with 4 factors and 5 levels was completed on the adjustable five rollers peeling machine.Four parameters, including rollers speed, rollers rotation angle, rollers V angle and rollers tilt angle were selected as the input variables, and peeling rate, meat yield and peeling time were selected as the output parameters.Quadratic orthogonal rotary regressive experimental design was employed to develop the second order polynomial regression model, which explained the relationship between the input and output parameters.By the Design-Expert 8.0.5b software, the corresponding mathematical regression model was established, the influence of significant factors on the quality of operation was analyzed, and the experimental parameters were optimized.The optimal combination of parameters determined was as follows: rollers speed was 25 r/min, rollers rotation angle was 315°, rollers V angle was 130° and rollers tilt angle was 18°.From the results of predicting model, the average of peeling rate was 94.71%, the meat yield was 85.10% and the peeling time was 54.61 s.In order to verify the feasibility of the parameter matching, with the optimal parameters, the verification test of the machine was carried out.Before the experiments, all the shrimps should be under the pretreatment of -30 ℃ for 10 min, all the heads of the shrimps were cut, and the length of the back opening was 6 ranks (from Section 1 to 6).The results showed that, under the combination of optimization parameters, the average of peeling rate was 94.67%, the meat yield was 85.23% and the peeling time was 54.33 s.The experimental results had little difference with the results predicted by the model.Through the shrimp peeling experiments, the adjustable five rollers peeling machine was basically consistent with the technical requirement.The research results can provide reference for the peeling parameter optimization of the shrimps of all ranks.