Aimed at the problem of the ordinary gel’ s weak strength，uncontrollable gelling time with well completion control in shale gas，a new type of the double crosslinking system MEA/MEB was used and the starch grafting modification was realized by the reaction of acrylamide （AM） and sodium methacrylate （NaMAA） with starch. By employing the high-temperature and high-pressure thickener to simulating the application environment of the gel system，the effect of the acrylamide dosage，crosslinking agent MEA dosage，the viscosity controlling agent HXC dosage，and pH value，et al，on the performance of the gel was investigated，and the gel’ s basic formulation was obtained as follows，5% starch + 4% acrylamide + 2% sodium methacrylate+ 0.125% cross-linking agent MEA + 5% crosslinking agent MEB + 6.5% toughening agent SL-2 + 0.0025% initiator APS. The thickening properties and the breakable property of the gel system were probed and enhancing degree of the gel system by three commonly-used weighing materials was investigated as well. The results showed that the basic formula gel materials could withstand the strength of 25 N. Through adjusting the pH value of 7—13，the gelling time of the obtained pack material ranged from 1 to 3 hours. The density of the gel material could be increased to 1.4 g/m³ after adding iron ore fines with 1200 mushes，meanwhile，the strength of the gel could be increased by 24%. The gel with high strength could be broken effectively by self-made environment-friendly breaker after well-completion operation，whose viscosity was as low as 42 mPa·s，which ensured the gel-breaking fluid flowback and provided guarantees for convenience and security of the field application of the gel packer.