The shear-stretch action of reservoir pores on weak gel was one of the key factors which influenced the gelling and plugging properties of weak gel when it flowed through the reservoir. The influences of this shear-stretch action on one kind of weak gel (HPAM solution + crosslinking agent) gelling properties were studied in this paper. The affected and unaffected weak gel solution were injected to sand-packed models and the influences of this shear-stretch action on weak gel profile-control properties were evaluated by the index of residual resistance coefficient. The results showed that the original viscosity of weak gel before and after shear-stretch of reservoir pores was 170 and 43 mPa·s, and the viscosity loss rate of gel was 74.7%. Meanwhile the viscous modulus and elastic modulus of the weak gel whose solution was sheared and stretched by pores and gelled in the static condition was reduced maximumly by 18% and 55% respectively, and the strength of gel decreased sharply. Compared with the unaffected sample, the maximum residual resistance coefficient of the sheared and starched weak gel which gelled in sand pack was reduced by 26.9 times in the gel injection part. And the reduction speed of this residual resistance coefficient was accelerated significantly with increasing water injection. The maximum residual resistance coefficient of sheared and starched weak gel in none gel injection part was reduced by 22.7 times. Thus the profile-control properties of sheared and stretched weak gel were significantly weakened by the pores’ shear-stretch action.