Based on the morphological change of surfactant aggregates in acid，self-diverting mud acid was formed and evaluated，which included15% HCl ，3% HF，4% diverting agent，1% corrosion inhibitor and 0.5% iron ion stabilizer. The system did not require a lot of calcium and magnesium ions in the acidification process to increase the acid viscosity and could only rely on their own aggregation morphology changes ，which effectively achieved the purpose of solution acid temporary diverting in sand and shale reservoirs. The system exhibited a maximum viscosity of 180 mPa·s and a maximum hydrodynamic diameter of 330.5 nm in average of micelle aggregate. This system had a good performance on reaction retardation ，indicated by only 13% dissolution rate after 20min in the acid-rock reaction. The system could endure high temperature ，which viscosity remained more than 60mPa·s after shearing 90min at 90℃. In addition ，this acid system had a good rheological behavior at high temperature and could degrade quickly with a viscosity of 10mPa·s when contacted with crude oil after 120 min. Field tests showed that acidification using self-diverting mud acid achieved remarkable effect.